Henrietta Leavitt discovered a relation between luminosity and period of variable stars, so it was possible to measure distance between two variable stars. I am curious to know how that was important back in time. How is the luminosity-period relation applied to measure distance? Was this method important because they finally had trusted apparent/absolute magnitude values to apply to the distance modulus equation?
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2$\begingroup$ Duplicate of and related to: astronomy.stackexchange.com/questions/3685/…; astronomy.stackexchange.com/questions/932/…; astronomy.stackexchange.com/questions/8037/…; astronomy.stackexchange.com/questions/1177/…. $\endgroup$– Py-serCommented Mar 5, 2015 at 9:20
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$\begingroup$ the first link is kind of what I wanted, but I would like to know more about the equations. And I still miss the last part of the question: luminosity-period and the distance modulus equation, how are they related? $\endgroup$– scapegoatCommented Mar 5, 2015 at 14:58
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$\begingroup$ Please, be more specific and edit your question if some of the links do not answer your (not yet formulated) question. $\endgroup$– Py-serCommented Mar 7, 2015 at 10:13
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