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On the 13th of March, 1781, between ten and eleven o'clock at night, Herschel was examining the small stars near H Geminorum with a seven-foot telescope, bearing a magnifying power of 227 times. One of these stars seemed to him to have an unusual diameter. The celebrated astronomer, therefore, thought it was a comet.
He said if you wish to assure yourself that ê Coronæ is a double star, first direct your telescope to a Geminorum, to z Aquarii, to m Draconis, to r Herculis, to a Piscium, to e Lyræ. Look at those stars for a long time, so as to acquire the habit of observing such objects. Then pass on to x Ursæ majoris, where the closeness of the two members is still greater.
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