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Description
~Navigating the Universe~
Celestial navigation systems are based on observation of the positions of the Sun, Moon, Planets and navigational stars. Such systems are in use as well for terrestrial navigating as for interstellar navigating. By knowing which point on the rotating earth a celestial object is above and measuring its height above the observer's horizon, the navigator can determine his distance from that subpoint. A Nautical almanac and a chronometer are used to compute the subpoint on earth a celestial body is over, and a sextant is used to measure the body's angular height above the horizon. That height can then be used to compute distance from the subpoint to create a circular line of position. A navigator shoots a number of stars in succession to give a series of overlapping lines of position. Where they intersect is the celestial fix. The moon and sun may also be used. The sun can also be used by itself to shoot a succession of lines of position (best done around local noon) to determine a position.
Stocks Used:
by
by
by
andby yours truly
Thanking you in advance here for any s you may grant as I do truly appreciate them.
©2009 Creativemikey. Please do not copy or reproduce my images without my permission.
Celestial navigation systems are based on observation of the positions of the Sun, Moon, Planets and navigational stars. Such systems are in use as well for terrestrial navigating as for interstellar navigating. By knowing which point on the rotating earth a celestial object is above and measuring its height above the observer's horizon, the navigator can determine his distance from that subpoint. A Nautical almanac and a chronometer are used to compute the subpoint on earth a celestial body is over, and a sextant is used to measure the body's angular height above the horizon. That height can then be used to compute distance from the subpoint to create a circular line of position. A navigator shoots a number of stars in succession to give a series of overlapping lines of position. Where they intersect is the celestial fix. The moon and sun may also be used. The sun can also be used by itself to shoot a succession of lines of position (best done around local noon) to determine a position.
Stocks Used:
by
by
by
andby yours truly
Thanking you in advance here for any s you may grant as I do truly appreciate them.
©2009 Creativemikey. Please do not copy or reproduce my images without my permission.
Image size
2163x2216px 527.88 KB
Make
NIKON CORPORATION
Model
NIKON D90
Shutter Speed
1/30 second
Aperture
F/5.6
Focal Length
24 mm
ISO Speed
200
Date Taken
Feb 16, 2009, 6:25:31 PM
© 2009 - 2024 creativemikey
Comments5
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Looks very nice. Like the concept here.