astrograph mean time

astrograph mean time

[′as·trō‚graf ¦mēn ′tīm]
(astronomy)
A form of mean time, used in setting an astrograph; mean-time setting of 1200 occurs when the local hour angle of Aries is 0°.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.