An astrolabe is an astronomical instrument dating to ancient times, its name deriving from the Ancient Greek for star-taker, also known by its own Arabic and Persian names. The source's lead does not specify a precise origin date or a single inventor or culture. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/
Facts
YearSourced to the subject's own account SignificanceSourced to the subject's own accountLater metal astrolabes avoided the warping that affected large wooden instruments, allowing bigger and more accurate builds. 1 Astrolabe
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1. Astrolabe (Wikipedia)
WikipediaLead section (entity-description)
An astrolabe is an astronomical instrument dating to ancient times.
History section, geared astrolabe sentence
The geared mechanical astrolabe was invented by Abi Bakr of Isfahan in 1235.
History section, metal astrolabes sentence
Metal astrolabes avoided the warping that large wooden ones were prone to, allowing the construction of larger and therefore more accurate instruments.
Associated With: Armillary sphere, History section, Ancient era subsection, armillary sphere sentence
An astrolabe is essentially a plane (two-dimensional) version of an armillary sphere, which had already been invented in the Hellenistic period
Associated With: Sextant, Introduction section
The astrolabe, which is a precursor to the sextant, is effective for determining latitude on land or calm seas.
Associated With: Planisphere, Construction section
The astrolabe is, therefore, a predecessor of the modern planisphere.
In Field: Marine Engineering, Categories
Marine navigation
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