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The Sun-Earth-Moon System. Tools of Astronomy The Moon Sun-Earth-Moon System. Chap. 28. Objectives. Tools of Astronomy – 28.1. describe electro-magnetic radiation. explain how telescopes work describe space exploration. http://www.physics.unr.edu/cshirley/images.html. - PowerPoint PPT Presentation
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The Sun-Earth-Moon The Sun-Earth-Moon SystemSystem
Chap. 28Chap. 28Chap. 28Chap. 28
Tools of Astronomy
The Moon
Sun-Earth-Moon System
Tools of Astronomy – 28.1
ObjectivesObjectives• describe electro-magnetic radiation.• explain how telescopes work• describe space exploration
http://www.physics.unr.edu/cshirley/images.html
I.I. Electromagnetic Radiation Electromagnetic Radiation (light) (light)
I.I. Electromagnetic Radiation Electromagnetic Radiation (light) (light)A.A. Only part of the spectrum is visible Only part of the spectrum is visible
(ROY G BIV)(ROY G BIV)
I.I. Electromagnetic Radiation Electromagnetic Radiation (light) (light)A.A. Only part of the spectrum is visible Only part of the spectrum is visible
(ROY G BIV)(ROY G BIV)
B.B. Most ‘light’ cannot be seen by the Most ‘light’ cannot be seen by the human eyehuman eye
I.I. Electromagnetic Radiation Electromagnetic Radiation (light) (light)A.A. Only part of the spectrum is visible Only part of the spectrum is visible
(ROY G BIV)(ROY G BIV)
B.B. Most ‘light’ cannot be seen by the Most ‘light’ cannot be seen by the human eyehuman eye
C.C. Different light has different Different light has different wavelengthswavelengths
I.I. Electromagnetic Radiation Electromagnetic Radiation (light) (light)A.A. Only part of the spectrum is visible Only part of the spectrum is visible
(ROY G BIV)(ROY G BIV)
B.B. Most ‘light’ cannot be seen by the Most ‘light’ cannot be seen by the human eyehuman eye
C.C. Different light has different Different light has different wavelengthswavelengths
D.D. Frequency is related to wavelengthFrequency is related to wavelength
The longer the wave the The longer the wave the the frequency the frequency
I.I. Electromagnetic Radiation Electromagnetic Radiation (light) (light)A.A. Only part of the spectrum is visible Only part of the spectrum is visible
(ROY G BIV)(ROY G BIV)
B.B. Most ‘light’ cannot be seen by the Most ‘light’ cannot be seen by the human eyehuman eye
C.C. Different light has different Different light has different wavelengthswavelengths
D.D. Frequency is related to wavelengthFrequency is related to wavelength
The longer the wave the The longer the wave the shortershorter the frequency the frequency
II.II. TelescopesTelescopes
Yerkes observatory (WI), 1897Yerkes observatory (WI), 1897
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
1.1. Purpose – to collect light Purpose – to collect light and focus itand focus it
Globular Star Cluster M15, Milky Way Globular Star Cluster M15, Milky Way
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
1.1. Purpose – to collect light Purpose – to collect light and focus itand focus it
2.2. Telescopes magnify objectsTelescopes magnify objects
This is the secondary function of a telescopeThis is the secondary function of a telescope
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes1.1. RefractorRefractor
http://www.yesmag.bc.ca/how_work/telescope.htmlhttp://www.yesmag.bc.ca/how_work/telescope.html
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes1.1. RefractorRefractor
a.a. Uses glass lensesUses glass lenses
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes1.1. RefractorRefractor
a.a. Uses glass lensesUses glass lenses
b.b. Often made from two lenses – Often made from two lenses – an objective and an eyepiecean objective and an eyepiece
http://www.astro-tom.com/telescopes/telescopes.htmhttp://www.astro-tom.com/telescopes/telescopes.htm
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes2.2. ReflectorReflector
http://www.yesmag.bc.ca/how_work/telescope.htmlhttp://www.yesmag.bc.ca/how_work/telescope.html
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes2.2. ReflectorReflector
a.a. Uses mirrorsUses mirrors
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes2.2. ReflectorReflector
a.a. Uses mirrorsUses mirrors
b.b. Light often strikes a series of Light often strikes a series of mirrorsmirrors
http://www.astro-tom.com/telescopes/telescopes.htmhttp://www.astro-tom.com/telescopes/telescopes.htm
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes2.2. ReflectorReflector
a.a. Uses mirrorsUses mirrors
b.b. Light often strikes a series of Light often strikes a series of mirrorsmirrors
http://www.astro-tom.com/telescopes/telescopes.htmhttp://www.astro-tom.com/telescopes/telescopes.htm
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes
C.C. BenefitsBenefits
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes
C.C. BenefitsBenefits
1.1. Can utilize a variety of detectorsCan utilize a variety of detectors
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes
C.C. BenefitsBenefits
1.1. Can utilize a variety of detectorsCan utilize a variety of detectors
2.2. Can focus more light than the eyeCan focus more light than the eye
II.II. TelescopesTelescopesA.A. IntroductionIntroduction
B.B. TypesTypes
C.C. BenefitsBenefits
1.1. Can utilize a variety of detectorsCan utilize a variety of detectors
2.2. Can focus more light than the eyeCan focus more light than the eye
3.3. Can make time exposure photosCan make time exposure photos
http://www.wam.umd.edu/~iblumgar/eclipse.html
II.II. TelescopesTelescopesD.D. LocationLocation
II.II. TelescopesTelescopesD.D. LocationLocation
1.1. Away from citiesAway from cities
II.II. TelescopesTelescopesD.D. LocationLocation
1.1. Away from citiesAway from cities
2.2. On high mountainsOn high mountains
Griffith Observatory – So. CaliforniaGriffith Observatory – So. California~1,100 feet~1,100 feet
Mt. Wilson Observatory – So. CaliforniaMt. Wilson Observatory – So. California~5,600 feet~5,600 feet
Keck Observatory – Mauna KeaKeck Observatory – Mauna Kea~14,000 feet~14,000 feet
http://www.ucolick.org/~kibrick/http://www.ucolick.org/~kibrick/
II.II. TelescopesTelescopesD.D. LocationLocation
E.E. Other telescopesOther telescopes1.1. Radio-telescopes collect Radio-telescopes collect .
http://pics.bothner.com/2002/RadioTelescope/
II.II. TelescopesTelescopesD.D. LocationLocation
E.E. Other telescopesOther telescopes1.1. Radio-telescopes collect Radio-telescopes collect radioradio waveswaves
2.2. Interferometry links multiple Interferometry links multiple ________________
II.II. TelescopesTelescopesD.D. LocationLocation
E.E. Other telescopesOther telescopes1.1. Radio-telescopes collect Radio-telescopes collect radioradio waveswaves
2.2. Interferometry links multiple Interferometry links multiple telescopestelescopes
VLA Radio Antennas – Socorro, NMVLA Radio Antennas – Socorro, NM
III.III. Collecting data beyond Collecting data beyond EarthEarth
III.III. Collecting data beyond Collecting data beyond EarthEarth
A.A. Space telescopesSpace telescopes
III.III. Collecting data beyond Collecting data beyond EarthEarth
A.A. Space telescopesSpace telescopes
B.B. Spacecraft/probesSpacecraft/probes
III.III. Collecting data beyond Collecting data beyond EarthEarth
A.A. Space telescopesSpace telescopes
B.B. Spacecraft/probesSpacecraft/probes
C.C. Space stationSpace station
The End
The Moon – 28.2
ObjectivesObjectives• describe the develop-ment of exploration of the Moon.• identify features on the Moon.• explain the theories about how the Moon formed.
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
The first The first , launched by , launched by ..
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
The first The first satellitesatellite, launched by , launched by RussiaRussia
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
first man in space, he was from first man in space, he was from ..
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
Yuri GagarinYuri Gagarin first man in space, he was from first man in space, he was from RussiaRussia..
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
C.C. Mercury (1961)Mercury (1961)
was the first American in space.was the first American in space.
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
C.C. Mercury (1961)Mercury (1961)
Alan Shepard JrAlan Shepard Jr was the first American in space. was the first American in space.
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
C.C. Mercury (1961)Mercury (1961)
D.D. Gemini (1963-1966)Gemini (1963-1966)
This craft was designed to carry This craft was designed to carry people. people.
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
C.C. Mercury (1961)Mercury (1961)
D.D. Gemini (1963-1966)Gemini (1963-1966)
This craft was designed to carry This craft was designed to carry 22 people. people.
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
C.C. Mercury (1961)Mercury (1961)
D.D. Gemini (1963-1966)Gemini (1963-1966)
E.E. Apollo 11 (1969)Apollo 11 (1969)
Landed the first man, Landed the first man, , on the moon., on the moon.
I.I. Historic MissionsHistoric MissionsA.A. Sputnik I (1957)Sputnik I (1957)
B.B. Vostok 1 (1961)Vostok 1 (1961)
C.C. Mercury (1961)Mercury (1961)
D.D. Gemini (1963-1966)Gemini (1963-1966)
E.E. Apollo 11 (1969)Apollo 11 (1969)
Landed the first man, Landed the first man, Neil ArmstrongNeil Armstrong, on the moon., on the moon.
II.II. Lunar PropertiesLunar Properties
II.II. Lunar PropertiesLunar PropertiesA.A. Earth’s moon is larger than mostEarth’s moon is larger than most
Only Jupiter and Saturn have larger moons.Only Jupiter and Saturn have larger moons.
II.II. Lunar PropertiesLunar PropertiesA.A. Earth’s moon is larger than mostEarth’s moon is larger than most
B.B. Earth’s moon is farther than mostEarth’s moon is farther than most
Most moons are closer to their planets.Most moons are closer to their planets.
II.II. Lunar PropertiesLunar PropertiesA.A. Earth’s moon is larger than mostEarth’s moon is larger than most
B.B. Earth’s moon is farther than mostEarth’s moon is farther than most
C.C. The moon is solid and rockyThe moon is solid and rocky
Not icy or gaseous like many other moons.Not icy or gaseous like many other moons.
II.II. Lunar PropertiesLunar PropertiesA.A. Earth’s moon is larger than mostEarth’s moon is larger than most
B.B. Earth’s moon is farther than mostEarth’s moon is farther than most
C.C. The moon is solid and rockyThe moon is solid and rocky
D.D. Earth’s moon is one of the few Earth’s moon is one of the few moons of the inner planets.moons of the inner planets.
Mercury and Venus have none, Mars’ moons are tinyMercury and Venus have none, Mars’ moons are tiny
III.III. The Moon’s SurfaceThe Moon’s Surface
III.III. The Moon’s SurfaceThe Moon’s SurfaceA.A. Has relatively low albedo (7%)Has relatively low albedo (7%)
Albedo describes amount of sunlight reflected.Albedo describes amount of sunlight reflected.
III.III. The Moon’s SurfaceThe Moon’s SurfaceA.A. Has relatively low albedo (7%)Has relatively low albedo (7%)
B.B. Temperatures fluctuate a lot (from Temperatures fluctuate a lot (from 400K to 100K)400K to 100K)
This is due to the moon’s lack of This is due to the moon’s lack of ..
III.III. The Moon’s SurfaceThe Moon’s SurfaceA.A. Has relatively low albedo (7%)Has relatively low albedo (7%)
B.B. Temperatures fluctuate a lot (from Temperatures fluctuate a lot (from 400K to 100K)400K to 100K)
This is due to the moon’s lack of This is due to the moon’s lack of an an atmosphereatmosphere..
III.III. The Moon’s SurfaceThe Moon’s SurfaceA.A. Has relatively low albedo (7%)Has relatively low albedo (7%)
B.B. Temperatures fluctuate a lot (from Temperatures fluctuate a lot (from 400K to 100K)400K to 100K)
C.C. HighlandsHighlands
Light in color, mountainous, and cratered.Light in color, mountainous, and cratered.
III.III. The Moon’s SurfaceThe Moon’s SurfaceA.A. Has relatively low albedo (7%)Has relatively low albedo (7%)
B.B. Temperatures fluctuate a lot (from Temperatures fluctuate a lot (from 400K to 100K)400K to 100K)
C.C. HighlandsHighlands
D.D. MariaMaria
Dark, smooth plains, associated with Dark, smooth plains, associated with rilles (long, narrow straight valleyrilles (long, narrow straight valley
III.III. The Moon’s SurfaceThe Moon’s Surface
Material expelled from crater. Long strands of Material expelled from crater. Long strands of ejecta are called ejecta are called raysrays..
E.E. Impact craters knock out ejecta.Impact craters knock out ejecta.
III.III. The Moon’s SurfaceThe Moon’s SurfaceE.E. Impact craters knock out ejecta.Impact craters knock out ejecta.
F.F. Moons craters are easier to see than Moons craters are easier to see than Earth’s.Earth’s.
This is because there is more This is because there is more on Earth. on Earth.
III.III. The Moon’s SurfaceThe Moon’s Surface
This is because there is more This is because there is more weatheringweathering on Earth. on Earth.
E.E. Impact craters knock out ejecta.Impact craters knock out ejecta.
F.F. Moons craters are easier to see than Moons craters are easier to see than Earth’s.Earth’s.
IV.IV. HistoryHistory
IV.IV. HistoryHistoryA.A. Believed to be 3.8 – 4.6 byo.Believed to be 3.8 – 4.6 byo.
Based on radioisotope dating of rocks.Based on radioisotope dating of rocks.
IV.IV. HistoryHistoryA.A. Believed to be 3.8 – 4.6 byo.Believed to be 3.8 – 4.6 byo.
B.B. Bombarded heavily by projectiles Bombarded heavily by projectiles for first 800 million years.for first 800 million years.
Most of the craters have dark ejecta meaning Most of the craters have dark ejecta meaning they’re old.they’re old.
IV.IV. HistoryHistoryA.A. Believed to be 3.8 – 4.6 byo.Believed to be 3.8 – 4.6 byo.
B.B. Bombarded heavily by projectiles Bombarded heavily by projectiles for first 800 million years.for first 800 million years.
C.C. This action produced regolith.This action produced regolith.
This is the loose, ground up moon rock.This is the loose, ground up moon rock.
IV.IV. HistoryHistoryA.A. Believed to be 3.8 – 4.6 byo.Believed to be 3.8 – 4.6 byo.
B.B. Bombarded heavily by projectiles Bombarded heavily by projectiles for first 800 million years.for first 800 million years.
C.C. This action produced regolith.This action produced regolith.
D.D. Maria formed later from magma.Maria formed later from magma.
This explains the darker color.This explains the darker color.
IV.IV. HistoryHistoryA.A. Believed to be 3.8 – 4.6 byo.Believed to be 3.8 – 4.6 byo.
B.B. Bombarded heavily by projectiles Bombarded heavily by projectiles for first 800 million years.for first 800 million years.
C.C. This action produced regolith.This action produced regolith.
D.D. Maria formed later from magma.Maria formed later from magma.
E.E. Flowing lava created rilles.Flowing lava created rilles.
Not created by flowing water, but flowing lava.Not created by flowing water, but flowing lava.
V.V. Formation TheoriesFormation Theories
V.V. Formation TheoriesFormation TheoriesA.A. Capture TheoryCapture Theory
Moon formed elsewhere and was captured by Moon formed elsewhere and was captured by Earth’s gravity.Earth’s gravity.
V.V. Formation TheoriesFormation TheoriesA.A. Capture TheoryCapture Theory
1.1. How did object slow down?How did object slow down?
V.V. Formation TheoriesFormation TheoriesA.A. Capture TheoryCapture Theory
1.1. How did object slow down?How did object slow down?
2.2. What explains similar composition What explains similar composition to Earth’s?to Earth’s?
V.V. Formation TheoriesFormation TheoriesA.A. Capture TheoryCapture Theory
B.B. Simultaneous Formation TheorySimultaneous Formation Theory
Moon and Earth formed in space at same Moon and Earth formed in space at same time, near each othertime, near each other
V.V. Formation TheoriesFormation TheoriesA.A. Capture TheoryCapture Theory
B.B. Simultaneous Formation TheorySimultaneous Formation Theory1.1. Explains same composition and Explains same composition and
proximity.proximity.
V.V. Formation TheoriesFormation TheoriesA.A. Capture TheoryCapture Theory
B.B. Simultaneous Formation TheorySimultaneous Formation Theory1.1. Explains same composition and Explains same composition and
proximity.proximity.
2.2. Does not explain Earth’s higher Does not explain Earth’s higher iron content.iron content.
V.V. Formation TheoriesFormation TheoriesC.C. Impact TheoryImpact Theory
Earth was hit by Mars-size object, and layers Earth was hit by Mars-size object, and layers of crust/mantle material were ejected.of crust/mantle material were ejected.
V.V. Formation TheoriesFormation Theories
1.1. Moon received iron-poor material.Moon received iron-poor material.
C.C. Impact TheoryImpact Theory
V.V. Formation TheoriesFormation Theories
1.1. Moon received iron-poor material.Moon received iron-poor material.
2.2. Heat evaporated water from moon.Heat evaporated water from moon.
C.C. Impact TheoryImpact Theory
The End
Sun-Moon-Earth System – 28.3
ObjectivesObjectives• Identify the relative
positions and motions of Earth, the Sun, and the Moon
• Describe the phases of the Moon.
• Explain eclipses of the Sun and Moon.
I.I. MotionMotion
We are moving at a speed of We are moving at a speed of mph around mph around the sun (and rotating about the sun (and rotating about mph). mph).
I.I. MotionMotion
We are moving at a speed of We are moving at a speed of 67,00067,000 mph around mph around the sun (and rotating about the sun (and rotating about 10001000 mph). mph).
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
How do we know there is motion?How do we know there is motion?
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
1.1. Apparent motion of sunApparent motion of sun
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
1.1. Apparent motion of sunApparent motion of sun
2.2. Apparent motion of moonApparent motion of moon
http://www.nasa.gov/vision/universe/watchtheskies/20jun_moonillusion.html
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
1.1. Apparent motion of sunApparent motion of sun
2.2. Apparent motion of moonApparent motion of moon
3.3. Apparent motion of starsApparent motion of stars
http://www.sufism.org/society/articles/sema_camille.html
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
B.B. Rate of motionRate of motion
Each day the sun moves an apparent 360Each day the sun moves an apparent 360º. This º. This means it appears to move means it appears to move º/minute. º/minute.
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
B.B. Rate of motionRate of motion
Each day the sun moves an apparent 360Each day the sun moves an apparent 360º. This º. This means it appears to move means it appears to move 0.250.25 º/minute. º/minute.
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
B.B. Rate of motionRate of motion
C.C. How do we know Earth is moving?How do we know Earth is moving?
. . .and not the rest of the universe?. . .and not the rest of the universe?
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
B.B. Rate of motionRate of motion
C.C. How do we know Earth is moving?How do we know Earth is moving?1.1. A Foucault pendulumA Foucault pendulum
http://en.wikipedia.org/wiki/Foucault_pendulum
I.I. MotionMotionA.A. Evidence of motionEvidence of motion
B.B. Rate of motionRate of motion
C.C. How do we know Earth is moving?How do we know Earth is moving?1.1. A Foucault pendulumA Foucault pendulum
2.2. Coriolis effectCoriolis effect
http://www.atmos.ucla.edu
II.II. Earth’s TiltEarth’s Tilt
II.II. Earth’s TiltEarth’s TiltA.A. Earth moves in a plane called the Earth moves in a plane called the
eclipticecliptic
II.II. Earth’s TiltEarth’s TiltA.A. Earth moves in a plane called the Earth moves in a plane called the
eclipticecliptic
B.B. Earth’s axis of rotation is not Earth’s axis of rotation is not perpendicular to its eclipticperpendicular to its ecliptic
It tilts by It tilts by ..
II.II. Earth’s TiltEarth’s TiltA.A. Earth moves in a plane called the Earth moves in a plane called the
eclipticecliptic
B.B. Earth’s axis of rotation is not Earth’s axis of rotation is not perpendicular to its eclipticperpendicular to its ecliptic
It tilts by It tilts by 23.523.5ºº..
23.523.5ºº
II.II. Earth’s TiltEarth’s TiltA.A. Earth moves in a plane called the Earth moves in a plane called the
eclipticecliptic
B.B. Earth’s axis of rotation is not Earth’s axis of rotation is not perpendicular to its eclipticperpendicular to its ecliptic
C.C. In the Northern hemisphere the In the Northern hemisphere the Sun’s Sun’s altitudealtitude in the sky is higher in the sky is higher in the in the ..
Altitude is measured in degrees from the observer’s horizon to the object..
II.II. Earth’s TiltEarth’s TiltA.A. Earth moves in a plane called the Earth moves in a plane called the
eclipticecliptic
B.B. Earth’s axis of rotation is not Earth’s axis of rotation is not perpendicular to its eclipticperpendicular to its ecliptic
C.C. In the Northern hemisphere the In the Northern hemisphere the Sun’s altitude in the sky is higher Sun’s altitude in the sky is higher in the in the summersummer..
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummera.a. ““Longest day” of the year (in Longest day” of the year (in
Northern hemisphere)Northern hemisphere)
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummera.a. ““Longest day” of the year (in Longest day” of the year (in
Northern hemisphere)Northern hemisphere)
b.b. Sun is directly overhead at Sun is directly overhead at Tropic of Cancer (23.5Tropic of Cancer (23.5º N)º N)
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummera.a. ““Longest day” of the year (in Longest day” of the year (in
Northern hemisphere)Northern hemisphere)
b.b. Sun is directly overhead at Sun is directly overhead at Tropic of Cancer (23.5Tropic of Cancer (23.5º N)º N)
c.c. Occurs around June 21Occurs around June 21
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummera.a. ““Longest day” of the year (in Longest day” of the year (in
Northern hemisphere)Northern hemisphere)
b.b. Sun is directly overhead at Sun is directly overhead at Tropic of Cancer (23.5Tropic of Cancer (23.5º N)º N)
c.c. Occurs around June 21Occurs around June 21
d.d. Sun never sets in Arctic circleSun never sets in Arctic circle
Summer SolsticeSummer Solstice
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
a.a. Most hours of darkness (in N. Most hours of darkness (in N. hemisphere)hemisphere)
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
a.a. Most hours of darkness (in N. Most hours of darkness (in N. hemisphere)hemisphere)
b.b. Sun is directly overhead at Sun is directly overhead at Tropic of Capricorn (23.5Tropic of Capricorn (23.5º S)º S)
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
a.a. Most hours of darkness (in N. Most hours of darkness (in N. hemisphere)hemisphere)
b.b. Sun is directly overhead at Sun is directly overhead at Tropic of Capricorn (23.5Tropic of Capricorn (23.5º S)º S)
c.c. Occurs around December 21Occurs around December 21
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
a.a. Most hours of darkness (in N. Most hours of darkness (in N. hemisphere)hemisphere)
b.b. Sun is directly overhead at Sun is directly overhead at Tropic of Capricorn (23.5Tropic of Capricorn (23.5º S)º S)
c.c. Occurs around December 21Occurs around December 21
d.d. Sun never rises in Arctic circleSun never rises in Arctic circle
Winter SolsticeWinter Solstice
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
3.3. EquinoxesEquinoxes
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
3.3. EquinoxesEquinoxesa.a. Occur at midpoint between Occur at midpoint between
solsticessolstices
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
3.3. EquinoxesEquinoxesa.a. Occur at midpoint between Occur at midpoint between
solsticessolstices
b.b. Sun directly overhead at Sun directly overhead at equatorequator
II.II. Earth’s TiltEarth’s TiltD.D. The solsticesThe solstices
1.1. SummerSummer
2.2. WinterWinter
3.3. EquinoxesEquinoxesa.a. Occur at midpoint between Occur at midpoint between
solsticessolstices
b.b. Sun directly overhead at Sun directly overhead at equatorequator
c.c. Both hemispheres receive equal Both hemispheres receive equal sunlightsunlight
Self CheckSelf Check1.1. At which point is summer solstice?At which point is summer solstice?
Self CheckSelf Check1.1. At which point is summer solstice?At which point is summer solstice?
2.2. At which point is the vernal equinoxAt which point is the vernal equinox
III.III. Phases of the MoonPhases of the Moon
III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
1.1. New moonNew moon
The moon is between Earth and the Sun – we The moon is between Earth and the Sun – we don’t see the lit surfacedon’t see the lit surface
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
1.1. New moonNew moon
2.2. Waxing crescentWaxing crescent
Waxing means increasingWaxing means increasing
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
1.1. New moonNew moon
2.2. Waxing crescentWaxing crescent
3.3. First quarterFirst quarter
Observed ¼ of the way through a lunar monthObserved ¼ of the way through a lunar month
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
1.1. New moonNew moon
2.2. Waxing crescentWaxing crescent
3.3. First quarterFirst quarter
4.4. Waxing gibbousWaxing gibbous
Gibbous means more than ½ but less than fullGibbous means more than ½ but less than full
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
5.5. Full moonFull moon
The moon is on opposite sides of the Earth from The moon is on opposite sides of the Earth from the Sun – we see the entire lit surfacethe Sun – we see the entire lit surface
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
5.5. Full moonFull moon
6.6. Waning gibbousWaning gibbous
Waning means decreasing in size/intensity Waning means decreasing in size/intensity
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
5.5. Full moonFull moon
6.6. Waning gibbousWaning gibbous
7.7. Third quarterThird quarter
Observed ¾ into the lunar monthObserved ¾ into the lunar month
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
5.5. Full moonFull moon
6.6. Waning gibbousWaning gibbous
7.7. Third quarterThird quarter
8.8. Waning crescentWaning crescent
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III.III. Phases of the MoonPhases of the MoonA.A. Names of the PhasesNames of the Phases
B.B. Synchronous RotationSynchronous Rotation
For each For each revolutionrevolution of the moon it makes one of the moon it makes one rotationrotation..
III.III. Phases of the MoonPhases of the MoonC.C. TimingTiming
III.III. Phases of the MoonPhases of the MoonC.C. TimingTiming
1.1. It takes the moon about 27.3 days It takes the moon about 27.3 days to complete its to complete its (a lunar (a lunar month).month).
III.III. Phases of the MoonPhases of the MoonC.C. TimingTiming
1.1. It takes the moon about 27.3 days It takes the moon about 27.3 days to complete its to complete its orbitorbit (a lunar (a lunar month).month).
2.2. During 24 hours the moon moves During 24 hours the moon moves 1/27.3 of its orbit which = 1/27.3 of its orbit which = º.º.
III.III. Phases of the MoonPhases of the MoonC.C. TimingTiming
1.1. It takes the moon about 27.3 days It takes the moon about 27.3 days to complete its to complete its orbitorbit (a lunar (a lunar month).month).
2.2. During 24 hours the moon moves During 24 hours the moon moves 1/27.3 of its orbit which = 1/27.3 of its orbit which = 1313º.º.
3.3. This means the Earth must rotate This means the Earth must rotate an extra 13º to ‘catch up to the an extra 13º to ‘catch up to the moon’.moon’.
Each night the moonrise occurs about Each night the moonrise occurs about minutes minutes later.later.
III.III. Phases of the MoonPhases of the MoonC.C. TimingTiming
1.1. It takes the moon about 27.3 days It takes the moon about 27.3 days to complete its to complete its orbitorbit (a lunar (a lunar month).month).
2.2. During 24 hours the moon moves During 24 hours the moon moves 1/27.3 of its orbit which = 1/27.3 of its orbit which = 1313º.º.
3.3. This means the Earth must rotate This means the Earth must rotate an extra 13º to ‘catch up to the an extra 13º to ‘catch up to the moon’.moon’.
Each night the moonrise occurs about Each night the moonrise occurs about 5050 minutes minutes later.later.
IV.IV. EclipsesEclipses
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
1.1. The moon creates a shadow that The moon creates a shadow that covers part of the Earthcovers part of the Earth
June 29, 2006 Solar EclipseJune 29, 2006 Solar Eclipse
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
1.1. The moon creates a shadow that The moon creates a shadow that covers part of the Earthcovers part of the Eartha.a. The The UmbraUmbra is the darker, inner is the darker, inner
part of the shadow.part of the shadow.
If the umbra passes over your location you see no If the umbra passes over your location you see no sun (sun ( Eclipse) Eclipse)
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
1.1. The moon creates a shadow that The moon creates a shadow that covers part of the Earthcovers part of the Eartha.a. The The UmbraUmbra is the darker, inner is the darker, inner
part of the shadow.part of the shadow.
If the umbra passes over your location you see no If the umbra passes over your location you see no sun (sun (TotalTotal Eclipse) Eclipse)
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
1.1. The moon creates a shadow that The moon creates a shadow that covers part of the Earthcovers part of the Eartha.a. The The UmbraUmbra is the darker, inner is the darker, inner
part of the shadow.part of the shadow.
b.b. The The PenumbraPenumbra is the lighter, is the lighter, outer shadow.outer shadow.
If the penumbra passes over your location you see If the penumbra passes over your location you see some of the sun (some of the sun ( Eclipse) Eclipse)
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
1.1. The moon creates a shadow that The moon creates a shadow that covers part of the Earthcovers part of the Eartha.a. The The UmbraUmbra is the darker, inner is the darker, inner
part of the shadow.part of the shadow.
b.b. The The PenumbraPenumbra is the lighter, is the lighter, outer shadow.outer shadow.
If the penumbra passes over your location you see If the penumbra passes over your location you see some of the sun (some of the sun (PartialPartial Eclipse) Eclipse)
Photos Taken During Photos Taken During Partial EclipsePartial Eclipse
Solar EclipseSolar Eclipse
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
B.B. Annular EclipseAnnular Eclipse
Occurs when the Earth/Moon system are Occurs when the Earth/Moon system are separated by maximum distance.separated by maximum distance.
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
B.B. Annular EclipseAnnular Eclipse
Furthest distance between Moon and Earth.Furthest distance between Moon and Earth.
1.1. ApogeeApogee
IV.IV. EclipsesEclipsesA.A. Solar EclipseSolar Eclipse
B.B. Annular EclipseAnnular Eclipse
Smallest distance between Moon and Earth.Smallest distance between Moon and Earth.
1.1. ApogeeApogee
2.2. PerigeePerigee
IV.IV. EclipsesEclipsesC.C. Lunar EclipseLunar Eclipse
Moon is partially blocked by the Moon is partially blocked by the ..
IV.IV. EclipsesEclipses
Moon is partially blocked by the Moon is partially blocked by the SunSun..
C.C. Lunar EclipseLunar Eclipse
IV.IV. EclipsesEclipses
1.1. These last longer than Solar These last longer than Solar eclipses because. . .eclipses because. . .
C.C. Lunar EclipseLunar Eclipse
IV.IV. EclipsesEclipses
1.1. These last longer than Solar These last longer than Solar eclipses because. . .eclipses because. . .
2.2. Even though moon passes through Even though moon passes through umbra, it is not completely dark umbra, it is not completely dark because. . .because. . .
C.C. Lunar EclipseLunar Eclipse
The End
The Moon’s Phases (from above)The Moon’s Phases (from above)