astrolabe
n. முற்கால உயர்வுமானி.
As"tro*labe, n. Etym: [OE. astrolabie, astrilabe, OF. astrelabe, F. astrolabe, LL. astrolabium, fr. Gr. 1. (Astron.) Defn: An instrument for observing or showing the positions of the stars. It is now disused. Note: Among the ancients, it was essentially the armillary sphere. A graduated circle with sights, for taking altitudes at sea, was called an astrolabe in the 18th century. It is now superseded by the quadrant and sextant. 2. A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere. Whewell.