Celestial Coordinates & Seasons

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ACROSS
1. Using Bayer's system of naming stars, this would the brightest star in a constellation.
3. Using Bayer's system of naming stars, this would the second brightest star in a constellation.
8. The astronomer's name for a specific area of the sky.
10. This area of the Earth has the longest daylight (and nightime) hours.
11. Having to do with objects "beyond the Earth".
16. The motion of the Earth responsible for day and night.
18. ____ Solstice. Earth’s position near or on December 21, at which the northern hemisphere has its minimum daylight hours.
20. The motion of the Earth responsible for seasonal changes.

DOWN
1. Right ____. The coordinate system (similar to longitude) for determining positions in the sky.
2. The Big Dipper is not a constellation (it's only "part of" a constellation). It should be called an ____.
4. Plane of Earth’s orbit about the Sun.
5. ____ equinox. Earth’s position in September when the lengths of day and night are equal.
6. This star (the "north star") is always very near your meridian.
7. The coordinate system (similar to latitude) for determining positions in the sky.
9. The point directly over you head.
12. This location always has equal amounts of day and night; and stars appear to rise straight up from the horizon as seen from here.
13. Vernal ____ Earth’s position in March when the lengths of day and night are equal.
14. Movement of the Earth's atmosphere causes stars to do this.
15. Summer ____ Earth’s position around June 21, at which the northern hemisphere has its maximum daylight hours.
17. The orientation of this helps to produce Earth's seasonal changes.
19. This object is always on the ecliptic.