Earth and the Sun

1. Earth and the Sun Earth Science 2013

2. Astronomy • Definition: The study of the ______, ______ and other objects in _____________

3. The Sun • 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

4. Earth • The ___________ we live on • Only Planet with __________ (that we know of…) • _________ ________ from the Sun

5. Earth • The Earth is an _________ planet • _________________________ • _________________________ • _________________________

6. 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 ________

7. 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 _______________

8. 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!

9. 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

10. 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 = _____________

11. Seasons

12. 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

13. Season’s interactive • Click here

14. 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 ___________

15. Four Seasons • Spring Equinox • Starts around _____________ • The Suns is directly over the _________ creating an equal amount of daytime and nighttime • Marks the beginning of ______________

16. 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 _____________

17. Four Seasons • Autumnal Equinox • Starts around _____________________ • The Suns is directly over the ____________ creating an equal amount of ___________ and ______________ • Marks the beginning of ______________

18. Climate Zones

19. 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.

20. Lunar Landing Sites