Across
- 3. Circular boundary where the sky seems to meet the ground or sea
- 5. The region of total shadow of Earth
- 6. 26,000 years for earth to wobble
- 8. July 4th, Earth's farthest point from the sun
- 10. Earth rotates, heliocentric model of universe
- 11. One billionth of a meter; the typical wavelength term
- 13. Bright gases just above the photosphere of the sun
- 15. A change in direction of a light wave, which passes through a convex lens
Down
- 1. A meteor in space before it enters Earth's atmosphere
- 2. The bright surface of the sun
- 4. Relatively dark spots on the sun that contain intense magnetic fields
- 7. A Model of the universe in which Earth is at the center of the revolving planets and stars
- 9. January 4th, Earth's closest point to the sun
- 12. The apparent path of the sun around the sky
- 14. A glowing cloud of gas or a cloud of dust reflecting the light of nearby stars