What is an astrolabe?

What is an astrolabe?

Picture taken on July 12, 2017 shows a general view of the Astrolabe, a polar logistic ship which will sail along the French Southern and Antarctic… This unsigned brass astrolabe is attributed to Gualterus Arsenius, a Flemish instrument maker from Louvain, Belgium. An astrolabe is in essence a… Persian astrolabe, 19th century.

How old is this Umayyad brass astrolabe?

Gallery assistant holds a rare Umayyad brass astrolabe, signed by Muhammad ibn al-Saffar, Spain, Cordoba, dated in Western Abjad 411 AH/1020 AD, with… Arabic 18th century planispheric or flat astrolabe, 18th century.

Who made the first astrolabe?

This astrolabe was made by Georg Hartmann , an instrument maker from Nuremberg, Germany. An astrolabe is in essence a model of the universe that an… Observation with astrolabe. Early navigational/astronomical instrument used to determine latitute/longitude of position Plate 96.

Where can I see an astrolabe in Paris?

An astrolabe is presented in the exhibition “The Song of the World”, 02 October 2007 at the Musee du Louvre in Paris. The exhibition, which takes… Unique 14th-century Astrolabe, the only known version created by a Muslim artist in a Christian-ruled city is seen before it was auctioned at the…

The astrolabe was a marriage of the planisphere and dioptra, effectively an analog calculator capable of working out several different kinds of problems in astronomy.

How is the Rete used in an astrolabe?

Some astrolabes have a narrow rule or label which rotates over the rete, and may be marked with a scale of declinations . The rete, representing the sky, functions as a star chart. When it is rotated, the stars and the ecliptic move over the projection of the coordinates on the tympan.

How do astronomers use an astrolabe to find the altitude?

With an astrolabe, astronomers could calculate the position of celestial objects, the time of day (or night), the time of year, the altitude of any object, the latitude and much more. One of the easiest calculations to make with an astrolabe is the altitude of an object above the horizon.

Can You Make your own astrolabe?

Make your own Astrolabe. by Dominic Ford. An astrolabe is an elaborate instrument which combines a mechanical model of the sky’s rotation through the night – similar to a modern planisphere – with an observing instrument which allows the altitudes of objects in the night sky to be measured.