Earth and the Sun
Earth Science 2013
• Definition: The study of the
______, ______ and other
objects in _____________
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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
Earth
• The ___________ we live on
• Only Planet with __________
(that we know of…)
• _________ ________ from the
Sun
Earth
• The Earth is an _________ planet
_________________________
_________________________
_________________________
Earth’s Movements
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____________: 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 ______________
Four Seasons
• 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 ______________
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