Across
- 2. In the equatorial coordinate system, the celestial equivalent of terrestrial longitude. It divides the celestial equator into 24 hours, each of 60 minutes __
- 4. In the equatorial coordinate system, the celestial equivalent of terrestrial latitude. Coordinates north of the celestial equator are measured in positive degrees from 0° to 90°, while coordinates to the south are measured in negative degrees. __
- 7. The projection into space of the earth's equator.
- 10. An imaginary sphere of which the observer is the center and on which all celestial objects are considered to lie. __
- 12. Day The synodic day may be described as the time between two co A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. nsecutive sunrises __
- 14. Any slow change in the orientation of an object's axis of rotation. For the Earth in particular, this phenomenon is referred to as the precession of the equinoxes. __
- 16. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. __
- 17. Any pattern of stars recognizable in Earth's night sky. An asterism may form part of an official constellation or it may be composed of stars from more than one constellation.__
- 18. When an object rotates, it turns around a central point or axis. One planetary day is defined as the time it takes a planet to rotate around its axis. _
- 19. The path among the stars traced by the Sun. The plane defined by the Earth's orbit around the Sun. __
Down
- 1. The plane of the observer that is perpendicular to the observers zenith._
- 3. As the Earth travels around the Sun, the Sun appears to pass in front of a succession of constellations. The linear path that the Sun describes across the sky is called the ecliptic. The constellations on that path are collectively called the zodiac and extend a few degrees above and below the ecliptic line. _
- 5. The angular distance of a place east or west of the prime. meridian at Greenwich, England. Usually expressed in degrees and minutes. _
- 6. The angular distance north or south of the equator of an object Coordinates north of the equator are measured in positive degrees from 0° to 90°, while coordinates to the south are measured in negative degrees. _
- 8. The imaginary point that is directly above a particular location on the celestial sphere. _
- 9. The action by a celestial body of going round in an orbit or elliptical course. _
- 11. The time it takes for the Earth to rotate about its axis so that the distant stars appear in the same position in the sky. __
- 13. A circle of constant longitude passing through a given place on the earth's surface and the terrestrial poles. __
- 14. Meridian The Earth's zero of longitude, which by convention passes through Greenwich, England._
- 15. A region on the celestial sphere surrounding a specific and identifiable grouping of stars. __