Daily Almanac for
Nov 30, 2009
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Dictionary


col'or in"dex



Astron.
1. the difference between the apparent photographic magnitude and the apparent visual magnitude of a star.
2. the difference between the magnitudes of a star in any two spectral regions.

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

colorimetercoloring
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