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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.
Shadows is a software package for the calculation and drawing of sundials and astrolabes, available as a freeware in its base level.. It has been developed by François Blateyron, software developer and amateur astronomer, who made it available on Internet since 1997 and continues to improve it. [1]
Canterbury Astrolabe Quadrant – Medieval astrolabe found in England; Celatone – Navigational aid reliant on tracking Jupiter's moons in the sky; Celestial sphere – Imaginary sphere of arbitrarily large radius, concentric with the observer; Charge-coupled device – Device for the movement of electrical charge
In the 2nd century BC, Hipparchus discovered precession, calculated the size and distance of the Moon and invented the earliest known astronomical devices such as the astrolabe. [19] Hipparchus also created a comprehensive catalog of 1020 stars, and most of the constellations of the northern hemisphere derive from Greek astronomy. [20]
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.
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SACS — Second Astrolabe Catalogue of Santiago [35] Saloranta — Jaakko Saloranta (telescopic asterisms) SAO — Smithsonian Astrophysical Observatory Star Catalog; Saurer — (for example: the open star cluster Saurer 1 at 7:18:18 / +1°53'12" in Canis Minor) SaWe — Sanduleak-Weinberger (planetary nebulae)
Enjoy a classic game of Hearts and watch out for the Queen of Spades!