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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]
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.
A Treatise on the Astrolabe is a medieval instruction manual on the astrolabe by Geoffrey Chaucer. It was completed in 1391. It was completed in 1391. It describes both the form and the proper use of the instrument, and stands out as a prose technical work from a writer better known for poetry, written in English rather than the more typical Latin.
Yantra Raj Yantra (a 2.43-metre bronze astrolabe, one of the largest in the world, used only once a year, calculates the Hindu calendar) [13] Yantra Raj; The Vrihat Samrat Yantra, which means the "great king of instruments", is 88 feet (27 m) high, making it one of the world's largest sundials.
A Treatise on the Astrolabe: addressed to his son Lowys by Geoffrey Chaucer A.D. 1391. London: N. Trubner & Co. OCLC 1129737770. Thomson, Ron B. (2022). Pseudo-Masha’allah, On the Astrolabe: A Critical Edition of the Latin Text with English Translation. Toronto: Volumes Publishing. ISBN 978-1-7782705-2-9
The Verona astrolabe is an archaeological discovery unearthed in the vaults of a museum in Verona, Italy. [1] Dating back to the eleventh century, this Islamic astrolabe is one of the oldest examples of its kind and is among the few known to exist worldwide. It appears to have been employed by Muslim, Jewish, and Christian communities spanning ...
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Mahendra Sūri (c. 1340 – 1400) [1] is the 14th century Jain astronomer who wrote the Yantraraja, the first Indian treatise on the astrolabe. [2] He was trained by Madana Sūri, and was teacher to Malayendu Sūri. [1] Jainism had a strong influence on mathematics particularly in the last couple of centuries BC. By the time of Mahendra Suri ...