This term credited to Hipparchus [hih-PAHR-kus] is still used even though his reason for using it was incorrect. Hipparchus classified objects into six classes, while one of the two modern measurement
This term credited to Hipparchus [hih-PAHR-kus] is still used even though his reason for using it was incorrect. Hipparchus classified objects into six classes, while one of the two modern measurements of this quantity is based on comparisons to the star Vega. To keep values on the y-axis between negative ten and positive twenty on a Hertzsprung-Russell diagram, astronomers use this quantity instead of luminosity. Name this quantity whose apparent and absolute values are measures of brightness.
This term credited to Hipparchus [hih-PAHR-kus] is still used even though his reason for using it was incorrect.