Astronomy

2. the action or process of rotating on or as if on an axis or center
5. an invisible force that pulls objects toward each other
6. the action or process of rotating on or as if on an axis or center
7. the natural satellite of the earth
11. celestial body that is in orbit around the Sun
13. measures the distance north or south of the equator
14. a closed-plane curve that results from the intersection of a plane cutting through a cone
15. one of the four periods of the year (spring, summer, autumn, and winter)

1. a natural luminous body visible in the sky especially at night
3. an event in which a planet's subsolar point passes through its Equator
4. pertaining to the period during which the visible surface of the moon increases
8. a regular, repeating path that one object in space takes around another one
9. The different shapes of the Moon that we see at different times of the month
10. to move or shift so as to lean or incline
12. very long-period waves that move through the ocean in response to the forces exerted by the moon and sun