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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References in periodicals archive ?
Yet, you see only one side of the coin--whether it be a sestertius or a quadrans.
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.
The shower's radiant, its apparent perspective point of origin, is in the antique constellation Quadrans Muralis about halfway from the end of the big Dipper's handle to the head of Draco, as seen at right.
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.
The Quadrantids derive their name from the constellation of Quadrans Muralis (mural quadrant), discovered by the French astronomer Jerome Lalande in 1795.
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.