astronomy

1. Southernmost point of orbital path
3. the imaginary shell we draw around the Earth which shows how we view objects in space
8. The time from one vernal equinox to next
10. the daily progress of the sun and stars across the sky
13. observation, theory, prediction, observation,
14. Northernmost point of orbital path
15. study of the universe
16. when the moon passes between the Earth and sun, blocking the sun
17. 23 hours and 56 minutes, the time it takes for the Earth to rotate on its axis
18. Lies directly over the South Pole of the Earth

2. The path that the sun makes through the sky
4. combination of day length and sunlight angle
5. Lies directly over the North Pole of the Earth, contains the North Star “Polaris”
6. The twelve constellations the Sun moves through during the year
7. Projection of the Earth’s Equator into space
9. caused by the way light from the sun shines or does not shine on the moon
11. when the earth's orbit blocks the sun from the moon
12. what we consider a 24-hour day