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Tag Archives: church
Geometrical Optics and the Hastings-Byrne Refractor
By John Church Some years ago I analyzed the objective lens of the AAAP’s historic 6-1/4-inch Hastings-Byrne (H-B) refractor and published the results in Sky & Telescope magazine, along with a history of the telescope1. The readers of Sidereal Times … Continue reading
Amateur Astronomers Association of Princeton 