A Orionis, very close to Orionis, is a very fine multiple star, described by Sir William Herschel as two sets of treble stars; more stars have been revealed by larger telescopes.
He was led to his three great laws by musical analogies, just as William Herschel afterwards passed from music to astronomy.
Sir William Herschel and afterwards F.
There is more than one meaning of William Herschel discussed in the 1911 Encyclopedia.
Sir William Herschel was the first astronomer who measured position angles; the instrument he employed is described in Phil.