/ (ˈpɒdʒsən) /
the brightness ratio of two celestial objects that differ by one magnitude. On the Pogson scale a difference of 5 magnitudes is defined as a difference of 100 in the intensities of two stars; therefore a difference of 1 magnitude is equal to the fifth root of 100, i.e. 2.512
Where Did The Word”Pi” Come From?Pi is the Latin name of the sixteenth Greek letter, π. But, where did it come from?
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Word Origin for Pogson ratio
C19: named after N. R. Pogson (1829–91), British astronomer
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