Henrietta Swan Leavitt

"The range of H 1255 is only four tenths of a magnitude, and on account of its brightness it is difficult to observe on all plates except those taken with the 1-inch Cooke lens. It seemed necessary, th…"

"It is worthy of notice that in Table VI the brighter variables have the longer periods. It is also noticeable that those having the longest periods appear to be as regular in their variations as those…"

"It is hoped that systematic study of the light changes of all the variables, nearly two thousand in number, in the two Magellanic Clouds may soon be undertaken at this Observatory."

"Apparently no sharp dividing line can be drawn between true Algol stars and those whose variations are continuous. Periods of nine variables in this region, which are of the Algol type or closely rese…"

"A remarkable relation between the brightness of these variables and the length of their periods will be noticed. In H.A. 60, No.4, attention was called to the fact that the brighter variables have the…"

"The discovery of variable stars, at this Observatory and elsewhere, has progressed so rapidly during the last five years, that the difficulty of keeping pace in observing and discussing them has becom…"

"P.E. Robinson, "Introductory Astronomy: Galaxy Distances and Lookback Time" video includes Leavitt's contribution"

"Since the variables are probably at nearly the same distance from the Earth, their periods are apparently associated with their actual emission of light, as determined by their mass, density, and surf…"