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Updated: April 30, 2025
Its construction thus marks a noticeable enlargement of astronomical possibilities, exemplified to cite one among many performances by Barnard's success in keeping track of cluster-variables when below the common limit of visual perception. With the Lick telescope results have also been achieved testifying to its unsurpassed excellence.
A large number of their minute components run through perfectly definite cycles of change in periods usually of a few hours. Altogether, about 500 "cluster-variables" have been recorded since 1895. It should be mentioned that Mr. David Packer and Dr. Common discerned, about 1890, some premonitory symptoms of light-fluctuation among the crowded stars of Messier 5.
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