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Across 4. When the sun and moon are aligned. 6. The day that acurs twice in a year when night and day are of equal length. 7. when an object orbits around a point. 9. When our viewpoint from earth lets us see only a small portion of the illuminated side of the moon. 11. What we see when the earth is aligned in front of the illuminated portion of the moon. 12. A star leading almost directly to the north pole. 13. The time after a full moon until a new moon when the illuminated portion appears to decrease. 16. An orbit (in this case) that moves across an oval shaped path. 17. Radiant energy that makes things and colors visible. 18. The darkest or most shielded core of a shadow.

Down 1. Referring to an oval shaped orbit. 2. The change in weather and other factors caused by the earths axis. 3. The earth divided in two by the equator. 5. The constant tilt of the earth. 7. When an object spins around its center point. 8. When the moon's illuminated portion can not be seen by earth. 10. The longest and shortest days of the year that occur because of the earth and suns seasonal relationship. 13. The period after a new moon when the visibly illuminated portion of the moon appears to increase. 14. An axis that is not vertical. 15. A perfect three dimensional circle.