Solar Energy

4. earth is tilted in space by about 23.5 degrees on average and is responsible for earth's seasons.
5. A typical star that is the source of light and heat for the planets in the solar system.
6. An imaginary circle around the middle of the earth, halfway between the North Pole and the South Pole
7. 66.5 degrees north latitude
9. a line of latitude about 23 degrees North of the equator
10. Refers to the spinning of our planet on its axis which takes 24 hours.
13. shortest day of the year
14. longest day of the year
15. the day of the year that marks the beginning of spring in the northern hemisphere
16. The day of the year that marks the beginning of fall in the Northern hemisphere
18. The two days of the year on which neither hemisphere is tilted toward or away from the sun
19. An imaginary line that passes through Earth's center and the North and South poles, about which Earth rotates
20. Either of the two times of the year when the sun is at its greatest distance from the equator

1. a line of latitude about 23 degrees South of the equator
2. light rays that do not hit the Earth straight on
3. continuous daylight, a time when the sun is visible at midnight during the summer in either the Arctic or Antarctic Circle
8. 66.5 degrees south latitude
11. This is the elliptical orbit of the Earth around the Sun. It takes 365.25 days to complete one orbit.
12. Period in the polar regions in winter when the sun does not rise
17. Sunlight that strikes Earth from straight overhead; vertical rays.