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REMINDERS:
•MasteringAstronomy Homework #0 due this Friday
•MasteringAstronomy Homework #1 available this evening
•Office Hours:Tuesday & Thursday afternoons, 2:00-3:00 PM
• Email: [email protected]
Tuesday, July 8, 2014
PHASES OF THE MOON
Tuesday, July 8, 2014
MOON PHASES
Tuesday, July 8, 2014
MOON PHASES
Tuesday, July 8, 2014
MOON PHASES
Waxing Waning
Tuesday, July 8, 2014
MOON PHASES
Full
New Moon = Dark
Waxing Waning
Tuesday, July 8, 2014
MOON PHASES
FullGibbous Gibbous
New Moon = Dark
Waxing Waning
Tuesday, July 8, 2014
MOON PHASES
FullGibbous GibbousQuarter Quarter
New Moon = Dark
Waxing Waning
Tuesday, July 8, 2014
MOON PHASES
FullGibbous GibbousQuarter Quarter
Crescent
New Moon = Dark
Waxing Waning
Crescent
Tuesday, July 8, 2014
LUNAR ANIMATIONS
http://astro.unl.edu/naap/lps/animations/lps.html
• http://astro.unl.edu/classaction/animations/lunarcycles/moonbisector.html
Tuesday, July 8, 2014
Tuesday, July 8, 2014
CLASS ACTION!
Tuesday, July 8, 2014
WHY DOES THE MOON HAVE PHASES?
• (A) As the moon moves in its orbit, different parts are illuminated, but the same side always faces Earth
• (B) Light rays are bent by the Moon’s gravity, and it appears dark when aligned correctly
• (C) The Sun is malfunctioning
• (D) The Earth casts a shadow on the Moon
Tuesday, July 8, 2014
WHY DOES THE MOON HAVE PHASES?
• (A) As the moon moves in its orbit, different parts are illuminated, but the same side always faces Earth
• (B) Light rays are bent by the Moon’s gravity, and it appears dark when aligned correctly
• (C) The Sun is malfunctioning
• (D) The Earth casts a shadow on the Moon
Tuesday, July 8, 2014
CAUSES OF LUNAR PHASES• The light we see from the Moon is reflected sunlight.
•Depending on where the Moon is in its orbit, our perspective from Earth changes
Tuesday, July 8, 2014
EARTH-MOON SYSTEM
•Moon Radius: 1737 km (~1/4 of Earth’s radius)
• Full Lunar cycle takes 29.5 days
• Earth-Moon average distance is 384,400 km
Tuesday, July 8, 2014
CLASS ACTION!
Tuesday, July 8, 2014
WHICH OF THE FOLLOWING POSITIONS IS A NEW MOON?
Tuesday, July 8, 2014
WHICH OF THE FOLLOWING POSITIONS IS A NEW MOON?
Tuesday, July 8, 2014
WHICH OF THE FOLLOWING POSITIONS IS A WANING CRESCENT?
Tuesday, July 8, 2014
WHICH OF THE FOLLOWING POSITIONS IS A WANING CRESCENT?
Tuesday, July 8, 2014
PREDICTING MOON PHASES
• If the Moon is at full phase when you observe it, what phase will it be at in 4 days?
• (A) Waning Gibbous
• (B) Waxing Crescent
• (C) Waning Half
• (D) New
Tuesday, July 8, 2014
PREDICTING MOON PHASES
• If the Moon is at full phase when you observe it, what phase will it be at in 4 days?
• (A) Waning Gibbous
• (B) Waxing Crescent
• (C) Waning Half
• (D) New
Tuesday, July 8, 2014
PREDICTING MOON PHASES
• The Moon phase for tonight is Waxing Gibbous (shown below). What will it be in 16 days on the day of our Midterm?
• (A) New
• (B) Full
• (C) Waning Crescent
• (D) Waxing Gibbous
Tuesday, July 8, 2014
PREDICTING MOON PHASES
• The Moon phase for tonight is Waxing Gibbous (shown below). What will it be in 16 days on the day of our Midterm?
• (A) New
• (B) Full
• (C) Waning Crescent
• (D) Waxing Gibbous
Tuesday, July 8, 2014
PREDICTING MOON PHASES
• The Moon phase for next Tuesday is Waning Quarter (shown below). What time (approximately) will it rise?
• (A) 6:00 AM (sunrise)
• (B) Noon
• (C) 6:00 PM (sunset)
• (D) Midnight
Tuesday, July 8, 2014
PREDICTING MOON PHASES
• The Moon phase for next Tuesday is Waning Quarter (shown below). What time (approximately) will it rise?
• (A) 6:00 AM (sunrise)
• (B) Noon
• (C) 6:00 PM (sunset)
• (D) Midnight
Tuesday, July 8, 2014
MOON RISE AND SET TIMES
Tuesday, July 8, 2014
ECLIPSES
• Lunar Eclipse: Earth comes between the Sun and the Moon, casting its shadow on the Moon
• Solar Eclipse: The Moon comes between the Sun and the Earth, blocking the Sun’s light
• Eclipses occur in seasons, twice per year as the orbits line up
Tuesday, July 8, 2014
ECLIPSES
Tuesday, July 8, 2014
LUNAR ECLIPSE
Tuesday, July 8, 2014
LUNAR ECLIPSE
Tuesday, July 8, 2014
LUNAR ECLIPSE
Tuesday, July 8, 2014
CLASS ACTION!
Tuesday, July 8, 2014
IF THE MOON’S ORBIT WAS NOT TILTED WITH RESPECT TO THE
EARTH...
• About how many eclipses might we see in one year?
• (A) 7
• (B) 12
• (C) 10
• (D) 29.5
Tuesday, July 8, 2014
IF THE MOON’S ORBIT WAS NOT TILTED WITH RESPECT TO THE
EARTH...
• About how many eclipses might we see in one year?
• (A) 7
• (B) 12
• (C) 10
• (D) 29.5
Tuesday, July 8, 2014
CLASS ACTIVITY!
Tuesday, July 8, 2014
LECTURE-TUTORIAL
Tuesday, July 8, 2014
LECTURE-TUTORIAL
• In your group, work through the following:
•The Cause of Moon Phases (pages 81-83)
• Discuss answers---don’t be silent!
• I will be walking around if you need help.
• If your group finishes early, check your answers with groups around you.
Tuesday, July 8, 2014
