lunar noon

lunar noon

[′lü·nər ′nün]
(astronomy)
The instant at which the sun is over the upper branch of any meridian of the moon.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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They tend to be firmly bound to the regolith until the surface temperatures spike near lunar noon. These molecules then 'thermally desorb' from the lunar soil to reach a nearby cold location where they can stick or populate Moon's "extremely tenuous atmosphere or exosphere, until temperatures drop and the molecules return to the surface."
A crater may appear to be a deep, dark well at sunrise, turn increasingly saucer-shaped as the Sun climbs high in the lunar sky, become a flat-looking white spot or ring near lunar noon, then reverse the process as the Sun declines, with shadows now reaching in the opposite direction.