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When the astrolabe is held vertically, the alidade can be rotated and the sun or a star sighted along its length, so that its altitude in degrees can be read ("taken") from the graduated edge of the astrolabe; hence the word's Greek roots: "astron" (ἄστρον) = star + "lab-" (λαβ-) = to take.
This glossary of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is concerned with the study of celestial objects and phenomena that originate outside the atmosphere of Earth. The field of astronomy features an extensive vocabulary and a ...
An astrolabe from the Mughal era exhibited at the National Museum in New Delhi, India. Yantrarāja is the Sanskrit name for the ancient astronomical instrument called astrolabe. It is also the title of a Sanskrit treatise on the construction and working of the astrolabe composed by a Jain astronomer Mahendra Sūri in around 1370 CE. [1]
The astrolabe, an instrument that has its origins in Hellenistic astronomy, is a predecessor of the modern planisphere. The term planisphere contrasts with armillary sphere, where the celestial sphere is represented by a three-dimensional framework of rings.
Jost Bürgi and Antonius Eisenhoit: Armillary sphere with astronomical clock, made in 1585 in Kassel, now at Nordiska Museet in Stockholm. An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that represent lines of celestial ...
New 5 in Sagittarius (thus mentioned on chart 22 of Wil Tirion's Sky-Atlas 2000.0, mentioned as ESO 285-G7 on charts 411 and 412 in Uranometria 2000.0 Volume 2, 1987 edition). New 6 in Indus (chart 23 in Tirion's Sky-Atlas 2000.0, chart 413 in the 1987 edition of Uranometria 2000.0, Volume 2) (as ESO 287-G13) NGC — New General Catalogue
In Muslim astronomy, the first star chart to be drawn accurately was most likely the illustrations produced by the Persian astronomer Abd al-Rahman al-Sufi in his 964 work titled Book of Fixed Stars. This book was an update of parts VII.5 and VIII.1 of the 2nd century Almagest star catalogue by Ptolemy .
This is a compilation of symbols commonly used in astronomy, particularly professional astronomy. Age (stellar) τ - age; ... additional terms may apply.