Vietnam or Thailand ? Vote for the TOP Country of the Week !
Updated: July 12, 2025
The manufacture of astronomical circles was brought to a very refined state of excellence early in the nineteenth century by Reichenbach at Munich, and after 1818 by Repsold at Hamburg. Bessel states that the "reading-off" on an instrument of the kind by the latter artist was accurate to about 1/80th of a human hair.
His earliest suspicions of non-uniformity in the proper motion of Sirius dated from 1834; they extended to Procyon in 1840; and after a series of refined measurements with the new Repsold circle, he announced in 1844 his conclusion that these irregularities were due to the presence of obscure bodies round which the two bright Dog-stars revolved as they pursued their way across the sphere.
HARDING. A small ring-plain W. of Gerard, remarkable for the peculiar form of its shadow at sunrise, and for the ridges in its vicinity. REPSOLD. The largest of a group of walled enclosures, close to the limb, on the E. side of the Sinus Roris.
Word Of The Day
Others Looking