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Across 4. imaginary sphere surrounding Earth (2wds) 5. the time needed between successive risings of a given star (2wds) 7. point on the celestial sphere directly above Earth's North Pole (3wds) 9. the average distance of Earth from the Sun (2wds) 10. one of eight bodies that orbit the Sun, visible to us by reflected sunlight 16. the twelve constellations on the celestial sphere through which the Sun appears 19. the projection of Earth's equator onto the celestial sphere (2wds) 20. the apparent motion of a relatively close object with respect to a more distant background 21. changes in average temperature and length of day that result from the tilt of the Earth's axis 22. celestial coordinate used to measure latitude above and below the celestial equator on the celestial sphere

Down 1. pair of quantities, right ascension and declination (2wds) 2. date on which the Sun crosses the celestial equator moving northward, near March 21(2wds) 3. point on the ecliptic where the Sun is at its northernmost point above the celestial sphere (2wds) 6. point on the celestial sphere directly below Earth's South Pole (3wds) 8. a human grouping of stars in the night sky into a recognizable pattern 11. method of determining distance based on the principle of geometry 12. date on which the Sun crosses the celestial sphere moving southward, near Sept . 22 (2wds) 13. celestial coordinate used to measure longitude on the celestial sphere (2 wds) 14. the time interval between one vernal equinox and the next.(2wds) 15. the period of time between the instant when the Sun is directly overhead to the next time it is directly overhead (2wds) 17. gravitationally bound collection of a large number of stars 18. the apparent path of the Sun