Quadrans


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Quadrans

1. An ancient Roman unit of area approximately equivalent to 631 square meters.

2. See: Teruncius.
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Ce type de partition n'est pas specifique a la Peninsule Iberique contrairement aux fractions du deuxieme groupe dont le but est de produire, apparemment des l'epoque augusteenne (Blazquez, 1998: 215217 ; Martin, 2017), des semis et plus rarement des quadrans a partir des as hispano-romains qui constituent l'essentiel de la masse monetaire circulante, pour compenser un manque de petit numeraire.
Discovered in 1795 by a French astronomer, Quadrans Muralis is no longer recognised by the International Astronomical Union, so today it's considered part of the constellation of Bootes - hence its alternative name The Bootids.
You will not, of course, find the constellation Quadrans Muralis (after which this shower is named) in your sky atlas, as this now defunct constellation never achieved recognition.
Moreover, the navigational instruments of the time had been developed by Jews; the quadrant, absolutely essential for long voyages in determining the position of a ship at sea, was known as the quadrans judaicus, a Jewish invention.
(http://www.space.com/28145-quadrantid-meteor-shower-2015.html) Space.com explains that Quadrantids meteor shower is named after a constellation named Quadrans Muralis or the Wall Quadrant.
The shower's radiant is in the obsolete constellation Quadrans Muralis, in northern Bootes between the end of the Big Dipper's handle and the head of Draco.
The Quadrantids derive their name from the constellation of Quadrans Muralis (mural quadrant), discovered by the French astronomer Jerome Lalande in 1795.
Bootes, Canes Venatici, and Coma Berenices all now rank as official constellations according to the International Astronomical Union, but Quadrans Muralis, a constellation invented by Joseph-Jerome Lefrancais de Lalande to recognize the importance of his observing instrument, has been disqualified from official duty.
This shower's name comes from Quadrans Muralis, a constellation between Draco and Bootes that no longer exists.