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who, by his continuous observations at Red-
hill, in Surrey, established the remarkable
fact that, while the rotation period in the
ˆ
highest latitudes, 50A, where spots are seen,
is twenty-seven-and-a-half days, near the equa-
tor the period is only twenty-five days. His
splendid volume of observations of the sun
led to much new information about the av-
erage distribution of spots at different epochs.
449
