Astrolabe - an ancient astronomical instruments

Astrolabe - is one of the most Wondrous astronomical instruments.
Wikipedia says with astrolabe worked like this:
Measure the height of the sun or the stars with the help of the alidade, turning the spider so that the image point of the ecliptic, in which the Sun is at the moment of the year, a horrible image of the star image almucantar corresponding to this height. In this case, on the face of the astrolabe is obtained stereographic image of the sky at the time of observation, and then determined the azimuth lights and the exact time and horoscope (letters. "Pointer hours") - the degree of the ecliptic, rising above the horizon at the time of observation.
All other methods of dealing with numerous astrolabe are derived from this basic techniques.

17 ph ancient devaysa via mail





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