Albert Michelson 20-foot Interferometer

was noted. Then the outer two mirrors would be moved apart and the measurement repeated. Eventually the fringes would disappear and the star would be "resolved". Doing this manually was very tedious and time consuming, which was a problem since the newly-commissioned 100-inch telescope in great demand. The diameters of only seven stars were successfully measured, all red giant stars: Betelgeuse, Arcturus, Antares, Aldebaran, Ras Algethi (Alpha Herculis), Scheat (Beta Pegasi), and Mira. The ...

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