North Polar Sequence See magnitude.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.
North Polar Sequence
a group of 96 stars in the vicinity of the north celestial pole with precisely measured photographic and photovisual stellar magnitudes. In 1922 the International Astronomical Union adopted the north polar sequence as the fundamental standard for astronomical photometry. The north polar sequence became less important as a standard in the late 1950’s as a result of the development of photoelectric photometry and the discovery of a number of shortcomings in the sequence as a standard.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
north polar sequence[′nȯrth ¦pō·lər ′sē·kwəns]
A list of stars in the vicinity of the north celestial pole whose photographic magnitudes have been measured as accurately as possible, and which are used as a basis for determining the magnitudes of other stars.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.