Across
- 3. Revolution" refers the object's orbital motion around another object. For example, Earth rotates on its own axis, producing the 24-hour day. Earth revolves about the Sun, producing the 365-day year.
- 4. large, bowl-shaped cavity in the ground or on the surface of a planet or the moon, typically one caused by an explosion or the impact of a meteorite or other celestial body.
- 10. A neap tide—seven days after a spring tide—refers to a period of moderate tides when the sun and moon are at right angles to each other.
- 11. A spring tide—popularly known as a "King Tide"—refers to the 'springing forth' of the tide during new and full moon.
- 12. s derived from the Latin umbra, meaning "shadow". It is also the Spanish and Portuguese word for "threshold", and sometimes used as a surname in that language
- 14. an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication.
- 16. the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of approximately equal length (about September 22 and March 20).
- 18. having or representing the sun as the center, as in the accepted astronomical model of the solar system.
- 20. the moon at any time after full moon and before new moon (so called because its illuminated area is decreasing).
Down
- 1. the moon at any time after new moon and before full moon, so called because its illuminated area is increasing
- 2. an eclipse in which the sun is obscured by the moon.
- 5. an eclipse in which the moon appears darkened as it passes into the earth's shadow.
- 6. the action of rotating around an axis or center.
- 7. a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
- 8. backside of the moon.
- 9. a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light
- 13. having or representing the earth as the center, as in former astronomical systems.
- 15. is used to describe something that is related to the moon. If you like astronomy, you probably enjoy lunar eclipses, when the Earth casts its shadow
- 17. the time or date (twice each year) at which the sun reaches its maximum or minimum declination, marked by the longest and shortest days (about June 21 and December 22).
- 19. a large, level basalt plain on the surface of the moon, appearing dark by contrast with highland areas.