Crossword

5. intersects the celestial sphere twice during a year at two points called
6. An obscuring of light from one celestial body by the passage of another between it and it's source of illumination
8. equinox that happens every March 20
10. astronomical model in which the earth and planets revolver around the sun
12. closed curve for which the sun of the distances from any point
15. stars that never seen to go away from the horizon or never set or rise
16. the sun revolves 360 degrees a year around on a path on the celestial sphere called
17. one of the two fixed points inside an ellipse
18. equinox that happens every September 22
19. the square of planet orbit and proportional to the sun
20. the path of an object that is in revolution

1. it serves as navigational aids for travelers and sailors
2. he explain what causes the phases of the moon
3. a theory or the structure of the solar system, in which the earth is the center of the universe
4. it is also called a satellite
7. law which follows an elliptical orbit
9. postulated that there must be a force of the sun that moves the planet
11. he was tasked to figure out the path of Mars
13. an ellipse the ratio of the distance between the foci to the major axis
14. he proposed a system of fixed spheres