A straight line can readily be drawn among each of the two series of points corresponding to the maxima and minima, thus showing that there is a simple relation between the brightness of the variables and their periods. (Henrietta Swan Leavitt)

A straight line can readily be drawn among each of the two series of points corresponding to the maxima and minima, thus showing that there is a simple relation between the brightness of the variables and their periods.

Henrietta Swan Leavitt

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brightness corresponding draw line maximum minimum relation series showing simple straight thus points

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