Across
- 2. A system that places the sun at or near the center of the solar system with planets orbiting around
- 3. A wide belt in the sky that follows the path of the sun, moon, and major planets
- 5. A group of visible stars that form a pattern or a shape in the night sky
- 7. Motion The movement of a astronomical body in a direction opposite to the rotation of its primary or surrounding system
- 9. A small circular orbit whose center moves along the circumference
- 14. The large main circular orbit centered on or near Earth along which the center of a planet's smaller secondary circle was thought to move
- 16. An imaginary, giant globe of infinite size that surrounds earth and helps astronomers map positions of the stars and planets
- 17. Two times a year when the sun reaches its greatest distance North or South from the celestial equator
- 18. Relating to the sky, outer space, or a divine heaven
- 19. A period in the year defined by the position of the earth's orbit in relation to the sun
- 20. Apparent yearly moment of the sun, stars, and constellations viewed from Earth
Down
- 1. Apparent daily movement of stars, the sun, and other celestial objects across the sky from East to West
- 4. A system that places a stationary Earth at the center of the universe
- 6. A asymetrical figure eight that can be traced in the sky at a given place
- 8. A great circle on the celestial sphere representing the sun's apparent path during the year
- 10. A popular pattern of stars in the night sky that is not an official constellation
- 11. A historical, hypothetical medium once believed to fill all of space beyond earth
- 12. An astronomical event that happens when one celestial object moves into the shadow of another
- 13. A planet that is mostly made up of rock and metal with a solid surface
- 15. The exact moment when the center of the sun crosses the Earth's celestial equator, resulting in equal amounts of day and night