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Across 4. point on the ecliptic where the Sun is at its northernmost point above the celestial sphere (2wds) 5. the period of time between the instant when the Sun is directly overhead to the next time it is directly overhead (2wds) 6. celestial coordinate used to measure longitude on the celestial sphere (2 wds) 13. a human grouping of stars in the night sky into a recognizable pattern 14. the average distance of Earth from the Sun (2wds) 15. celestial coordinate used to measure latitude above and below the celestial equator on the celestial sphere 16. the projection of Earth's equator onto the celestial sphere (2wds) 19. point on the celestial sphere directly above Earth's North Pole (3wds) 20. method of determining distance based on the principle of geometry 21. imaginary sphere surrounding Earth (2wds) 22. gravitationally bound collection of a large number of stars

Down 1. date on which the Sun crosses the celestial equator moving northward, near March 21(2wds) 2. one of eight bodies that orbit the Sun, visible to us by reflected sunlight 3. pair of quantities, right ascension and declination (2wds) 7. point on the celestial sphere directly below Earth's South Pole (3wds) 8. the time needed between successive risings of a given star (2wds) 9. date on which the Sun crosses the celestial sphere moving southward, near Sept . 22 (2wds) 10. the time interval between one vernal equinox and the next.(2wds) 11. changes in average temperature and length of day that result from the tilt of the Earth's axis 12. the twelve constellations on the celestial sphere through which the Sun appears 17. the apparent path of the Sun 18. the apparent motion of a relatively close object with respect to a more distant background