so'lar day'

1. Astron.the time interval between two successive transits by the sun of the meridian directly opposite that of the observer; the 24-hour interval from one midnight to the following midnight.
2. Law.the period of time from sunrise to sunset.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

solar cyclesolar energy
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