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Sextans is a medium sized constellation bordering Leo to the north, touching on Hydra to the southwest, and Crater to the southeast. The recommended three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is "Sex". [2]
A sextant. A sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation.
The first known mural sextant was constructed in Ray, Iran, by Abu-Mahmud al-Khujandi in 994. [1] To measure the obliquity of the ecliptic, al-Khujandī invented a device that he called al-Fakhri sextant (al-suds al Fakhrī), a reference to his patron, Buwayhid ruler, Fakhr al Dawla (976–997).
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The sextant referred to in the intro as being invented in 995 is a mural sextant. This is not a reflecting instrument and is not anything like the sort of thing discussed in the majority of the article. Ditto Brahe's instrument - that was a direct reading sextant - a span of 60° gave a reading range of 60°.
An equatorial sextant is a modified version of a sextant. One historically significant instrument called by that name was John Flamsteed 's equatorial sextant, installed in the Greenwich Observatory in 1676.
Sextans A (also known as UGCA 205) is a small dwarf irregular galaxy.It spans about 5000 light-years across, and is located at 4.3 million light-years away, in the outskirts of the Local Group of galaxies, which includes the Milky Way galaxy, and to which Sextans A may or may not belong.
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