Seasons Vocabulary

4. a single course of orbiting of one heavenly body around another
6. the solstice on or about December 21st that marks the beginning of winter in the Northern Hemisphere
7. a triple star, composed of a binary star and a Cepheid variable. Precession of Earth's axis made the star Thuban, in the constellation Draco, the North Star in ancient Egyptian times; it will cause the North Pole to point toward Vega, in the constellation Lyra, 12,000 years from now
9. the cold season between autumn and spring in northern latitudes (in the Northern Hemisphere from the winter solstice to the vernal equinox; in the Southern Hemisphere from the summer solstice to the autumnal equinox)
11. the great circle of the earth that is equidistant from the North Pole and South Pole
12. the action of rotating around an axis or center
13. the half of the earth between the North Pole and the equator
16. high angle in the sky
18. the time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox or spring equinox) and September 22 (autumnal equinox)
19. an imaginary line about which a body rotates

1. the season between spring and autumn, in the Northern Hemisphere from the summer solstice to the autumnal equinox, and in the Southern Hemisphere from the winter solstice to the vernal equinox
2. the northern tropic
3. the southern tropic
5. the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun
8. the half of the earth between the South Pole and the equator
10. the solstice on or about June 21st that marks the beginning of summer in the Northern Hemisphere
13. the end of the earth's axis of rotation, marking the northernmost point on the earth
14. low angle in the sky
15. the southern end of the earth's axis, the southernmost point on earth
17. the system of those sequential relations that any event has to any other, as past, present, or future