bright segment

bright segment

[′brīt ‚seg·mənt]
(geophysics)
A faintly glowing band which appears above the horizon after sunset or before sunrise. Also known as crepuscular arch; twilight arch.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
A setting of 1/4 second at f/8 with ISO 400 film, for example, will "burn in" the Moon's bright segment but bring out some details within the umbra itself.
Try operating your telescope at 50 [yen] or more and moving the Moon's bright segment entirely outside the field to get the clearest view of the dim regions inside the umbra.
Moving forward, the USDA said the domestic hog and chicken industries "continue to be the bright segments of Philippine agriculture."
The fire in her opal ring has died (141), while the husband, practising swipes with his heavy sword, "cut bright segments from the air" (141).