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--- wiki:astronomy [2023/11/11 21:31] – Roy Prouty
+++ wiki:astronomy [2023/11/14 12:25] (current) – Roy Prouty
@@ Line 9: / Line 9: @@
-Another common procedure in this arrangement of stars is to arrange them by brightness. The brightness scale used has changed over the years, but we now use a fairly robust [[~:..:magnitude|magnitude system]] to organize stars by brightness.
+Another common procedure in this arrangement of stars is to arrange them by brightness. A relative brightness scale called the magnitude system has changed over the years, but we now use a fairly robust [[~:magnitude|magnitude system]] to organize stars by relative brightness.\\ \\
+For absolute units, we will use the SI system of units. These --- as well as their spectral counterparts --- constitute the absolute scale of physical quantities we can use to arrange stars and other sources. See [[~:radiative_quantities|radiative quantities]] for more information on these. ((See [[~:magnitude|Magnitude System]] for an idea of how to change between the two scale types.))
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