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On the method of observing the changes that happen to the fixed stars
with some remarks of the stability of the light of our sun. To which is added, catalogue of comparative brightness, for ascertaining the permanency of the Lustre of stars. By William Herschel, LL. D. F. R. S. From the Philosophical Transactions -
On the periodical star [alpha] Herculis
with remarks tending to establish the rotatory motion of the stars on their axes. To which is added a second catalogue of the comparative brightness of the stars. By William Herschel, LL.D. F.R.S. From the Philosophical transactions