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Revolution of the earth is a motion of the earth in its orbit around the sun. In 1 year the sun would appear to make 1 complete trip around the earth from west top east
Archive for the ‘Nautical Astronomy’ Category
APPARENT MOTION
Posted by admin on April 5th, 2008
Oblique sphere
Posted by admin on April 5th, 2008
Oblique sphere is a celestial sphere as it appears to an observer between the equator and the pole, where the celestial bodies appear to rise obliquely to the horizon
Twilight is a period of incomplete darkness following sunset and proceeding sunrise. Three kinds of twilight are defined, defending upon the darker limit:
Posted in Nautical Astronomy 
Tags: bright stars, celestial bodies, celestial sphere, darkness, equator, horizon, Oblique sphere, proceeding, sunrise, sunset, twilight 
No Comments »APPARENT MOTION
Posted by admin on April 4th, 2008
Rotation of the earth. The apparent motion due to rotation of the earth causes celestial bodies to appear and rise somewhere along the eastern half of the horizon, climb to the maximum altitude as they cross the meridian, and set along the western horizon, at about the same point relative to due west as the [...]
HORIZON SYSTEM OF COORDINATES
Posted by admin on April 2nd, 2008
Prime vertical is the vertical circle through the east and west points of the horizon and perpendicular to the vertical circle
Altitude is an angular distance above the horizon and is measured along a vertical circle, from 0 degree at the horizon through 90 degree at the zenith
THE CELESTIAL SPHERE
Posted by admin on April 2nd, 2008
The celestial sphere is an imaginary sphere of infinite radius with the earth at its center
