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Seminars

The Botjes Miniature Planetarium, Driven and Regulated by a Chauncey Jerome Clock

Clarence Menninga, Professor of Geology, Emeritus
Friday, November 16, 3:30 p.m. NH078

In 1988 Henry and Bertha Bos offered to give Calvin College an antique miniature planetarium, on condition that it be restored to operating condition and placed on display at the College. The planetarium had been constructed by Wildrik Botjes in The Netherlands, and was initially placed in operation in 1868. The offer was accepted, and the restored planetarium was placed on display in North Hall in 1992. Clarence Menninga, Professor of Geology, Emeritus, will tell the story, and will describe the functions of the planetarium and the Chauncey Jerome chronometer that powers and regulates it.

 



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