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Across 3. A regular oval shape, traced by a point moving in a plane. 5. A round solid figure. 6. A half of a sphere. 7. The phases of the moon that are slowly getting illuminated. 8. Move or cause to move into a sloping position. 9. The action of rotating around an axis or center. 12. An eclipse in which the sun is obscured by the moon. 15. The lunar phase that occurs when the Moon is completely illuminated as seen from Earth. 16. The phases of the moon that are slowly fading away. 17. An imaginary line about which a body rotates.

Down 1. The curved sickle shape of the waxing or waning moon. 2. Having the form of an ellipse. 4. The natural agent that stimulates sight and makes things visible. 5. Each of the four divisions of the year (spring, summer, autumn, and winter). 9. The movement of one object around a center or another object. 10. The fully shaded inner region of a shadow cast by an opaque object. 11. The first phase of the Moon. 12. Either of the two times in the year, the summer or the winter. 13. The time or date (twice each year) at which the sun crosses the celestial equator. 14. The Pole Star or North Star.