Science Puzzle

2. is the region of total shadow of earth
4. tides occur at the 1st and 3rd qtr moon when the moon and sun pull at right angles to each other
6. period is an object's orbital period relative to the sun
7. In the Ptolemaic theory, the point off-center in the deferent from which the center of the epicycle appears to move uniformly
9. star any planet visible in the evening sky
11. January 4, earth's closest point to the sun
12. A model of the solar system in which the sun is at the center, with Earth and the other planets revolving around it, such as the Copernican universe
14. period the 27.322 days it takes the moon to orbit eastward around the Earth
15. star any earth visible in the sky shortly before sunrise

1. The small circle followed by a planet in the Ptolemaic theory. The center of the epicycle follows a larger circle (the deferent) around Earth.
3. equinox is September 22, the place where it crosses the celestial equator moving southward
5. equinox March 21, the place where the sun crosses the celestial equator moving northward
8. A model of the universe in which Earth is at the center of the revolving planets and stars
10. In the Ptolemaic theory, the large circle around Earth along which the center of the epicycle was thought to move
13. solstice December 22, the sun is farthest south