astronomy the magnitude of a star as determined by visual observation: Compare photoelectric magnitude
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use visual magnitude in a sentence
The photographic magnitude of a star will in these lectures be denoted by m′, corresponding to a visual magnitude m.
The following table contains all stars the apparent visual magnitude of which is brighter than 1m.5.
Sirius and Canopus are the only stars in the sky having a negative value of the apparent visual magnitude.
The bluer the star, the brighter will be its photographic as compared with its visual magnitude.The Popular Science Monthly, July, 1900 | Various