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Earth and the Sun. Earth Science 2013. Astronomy. Definition: The study of the ______, ______ and other objects in _____________. The Sun. The Sun is the center of our ______________ There are ____ planets in our solar system We are __________________from the Sun - PowerPoint PPT Presentation
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Earth and the SunEarth Science 2013
• Definition: The study of the ______, ______ and other objects in _____________
Astronomy
• The Sun is the center of our ______________• There are ____ planets in our solar system• We are __________________from the Sun• The Sun is responsible for all the _______ we
receive on Earth
The Sun
Earth
• The ___________ we live on• Only Planet with __________
(that we know of…)• _________ ________ from the
Sun
Earth• The Earth is an _________ planet
___________________________________________________________________________
Earth’s Movements• ____________: One spin on its axis• Takes about ___________to rotate once• This rotation causes _______ and ________• Sun always rises in the _____ and sets in the
________
Earth’s Movements
• _____________ (orbit): One lap around the Sun
• This takes about _________or one year to complete
• The path is not quite a circle; its more of an _______________
Calendars• ______________ mark time on earth in 24
hour days and 365 days per year• The __________ astronomers counted the
days between the appearance of the star Sirius and found an average of 365 days between appearances.
• So the Egyptians came up with one of the first Calendars!
Leap Years• The path of the Earth around the Sun actually
takes ____________to complete.• Every fourth year we add up the extra time
¼ + ¼ + ¼ + ¼ = _________________• This day is added to the calendar every 4 years
on __________________• Leap Years: 2004, 2008, 2012, 2016, 2020,
2024, 2028, etc
Earth’s Tilt
• Earth has seasons because ______ _______as it moves around the Sun
• WE ARE IN THE __________ ____________• When the Northern Hemisphere is tilted
towards the Sun, we get the most sunlight = _____________
• When the Northern hemisphere is tilted away from the Sun, we get the least sunlight = _____________
Seasons
Seasons
• Most places on Earth have 4 distinct seasons: _____________________________________
• The length of each season depends on its location on the Earth and how the _________ hits the Earth
• The __________________of the Earth creates three different climates: tropical, temperate, and polar
Season’s interactive
• Click here
Four Seasons
• Winter Solstice– Starts around _________________– Northern Hemisphere is tilted _________ from
the Sun– The rays from the Sun are the ___________– _______________ day of the year in Northern
Hemisphere; longest day of the year in the Southern Hemisphere
– Marks the beginning of ___________
Four Seasons• Spring Equinox
Starts around _____________The Suns is directly over the _________
creating an equal amount of daytime and nighttime
Marks the beginning of ______________
• Summer Solstice– Starts around _______________– Northern Hemisphere is tilted __________ the
Sun– The rays from the Sun are the ____________– ____________ day of the year in Northern
Hemisphere; shortest day of the year in the Southern Hemisphere
– Marks the beginning of the _____________
Four Seasons
• Autumnal Equinox– Starts around _____________________– The Suns is directly over the ____________
creating an equal amount of ___________ and ______________
– Marks the beginning of ______________
Four Seasons
Climate Zones
The Moon
• The Moon takes ___________ to revolve around the Earth
• The Moon takes 27.3 days to ___________on its axis
• Therefore, we only ever see __________of the moon.
Lunar Landing Sites