astrolabe is an instrument that have many functions: to calculate the position of the sun and stars, measure the heights ....
The astrolabe of Ibrahim ibn Said al-Sahli [XI century AD., Toledo] This instrument was manufactured in Toledo planispheric by astrolabista Ibrahim Said al-Sahali, whose name and the year of implementation, 459 AH / 1067 AD., Appear in an inscription in Arabic on the back. It is made of brass and consists of four main parts: a box or "mother" of five plates representing different latitudes, a network or "spider" with indicators for twenty-four stars and an alidade. The obverse, or "back" - carries a zodiac calendar and a scale altímetra called "square shadows." Astrolabio or astrolabes are instruments that have many functions: to calculate the position of the sun and stars, measure the heights and distances, provide a calendar and clock. Have also been used as navigational instruments until they were replaced by the Quadrant. They have been very useful for measuring time, day or night, and to set times of prayer. Have also been applied in astrology, agronomy,
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Keywords: astrolabe, astrolabio, calendar, history, instrument, measuring
