Information about Equatorium

Astrometry is the branch of astronomy that relates to precise measurements and explanations of the positions and movements of stars and other celestial bodies. Although once thought of as an esoteric field with little useful application for the future, the information obtained by
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Norden bombsight was a highly sophisticated optical/mechanical analog computer used by the United States Army Air Force during World War II, the Korean War, and the Vietnam War to aid the pilot of a bomber aircraft in dropping bombs accurately.
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An astronomer or astrophysicist is a person whose area of interest is astronomy or astrophysics.

Astronomy was more concerned with the classification and description of phenomena in the sky, while astrophysics attempted to explain these phenomena and the differences
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astrologer practices one or more forms of astrology. Typically an astrologer draws a horoscope for the time of an event, such as a person's birth, and interprets celestial points and their placements at the time of the event to better understand someone, determine the
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Al-Andalus (Arabic: الأندلس al-andalus) was the Arabic name given to those parts of the Iberian Peninsula governed by Muslims, or Moors, at various times in the period between 711 and 1492.
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As a means of recording the passage of time, the 11th century was that century which lasted from 1001 to 1100.

In the history of European culture, this period is considered the early part of the High Middle Ages.
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Al-Andalus (Arabic: الأندلس al-andalus) was the Arabic name given to those parts of the Iberian Peninsula governed by Muslims, or Moors, at various times in the period between 711 and 1492.
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Moon  

The Moon as seen by an observer on Earth
Orbital characteristics
Periapsis: 363,104 km
0.0024 AU
Apoapsis: 405,696 km
0.0027 AU
Semi-major axis: 384,399 km
0.
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The Sun

Observation data
Mean distance
from Earth 1.49610¹¹ m
(8.31 min at light speed)
Visual brightness (V) −26.74^{m [1]}
Absolute magnitude 4.
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planet, as defined by the International Astronomical Union (IAU), is a celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, not massive enough to cause thermonuclear fusion in its core, and has cleared its neighbouring region of
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Astronomical objects are significant physical entities, associations or structures which current science has confirmed to exist in space. This does not necessarily mean that more current science will not disprove their existence.
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Ahmad Y Hassan (born 1925) is a chevalier of the Légion d'honneur and a historian of Islamic and Arabic science and technology, educated in Jerusalem, Cairo and London with a Ph.D. in Mechanical engineering from University College London.
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Antikythera mechanism (Greek: Ὁ μηχανισμός των Αντικυθήρων, Ho mēchanismós tōn Antikythērōn
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An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of the celestial sphere.

History

The earliest known armillary sphere was invented by the ancient Greek Eratosthenes in 255 BC.
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An astrarium, also called a planetarium, is the mechanical representation of the cyclic nature of astronomical objects in one timepiece. It is an astronomical clock.

History

Greek and Roman World

The first astraria were mechanical devices.
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astrolabe is a historical astronomical instrument used by classical astronomers, navigators, and astrologers. Its many uses included locating and predicting the positions of the Sun, Moon, planets and stars; determining local time given local longitude and vice-versa; surveying;
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Astrology (from Greek: αστήρ, αστρός (astér, astrós), "star", and λόγος, λόγου (lógos, lógou), "word" or "speech" lit.
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astronomical clock is a clock with special mechanisms and dials to display astronomical information, such as the relative positions of the sun, moon, zodiacal constellations, and sometimes major planets.
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Islamic astronomy or Arabic astronomy refers to the astronomical developments made by the Islamic civilization between the 8th and 17th centuries and written in Arabic.
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orrery is a mechanical device that illustrates the relative positions and motions of the planets and moons in the solar system in heliocentric model. They are typically driven by a large clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the
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planetarium is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation. A dominant feature of most planetariums is the large dome-shaped projection screen onto which scenes of stars,
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The Prague Astronomical Clock or Prague Orloj (Czech: Pražskı orloj, [praʒski: ɔrlɔi]
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This article is about the Sextant as used for navigation. For the astronomer's sextant, see Sextant (astronomical).

For the history and development of the sextant see Reflecting instruments

A sextant
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The torquetum or turquet is a medieval astronomical instrument designed to take and convert measurements made in three sets of coordinates: Horizon, equatorial, and ecliptic. In a sense, the Torquetum is an analog computer.
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