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Showing posts from December, 2019

Transit of Mercury - November 11, 2019

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December 06, 2019

Panasonic G9 at prime focus of 80mm refractor, focal length = 400mm

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Theme images by Michael Elkan

Tom Bretl: Retired high school math and science teacher who is currently doing volunteer work as a tutor, educational software developer, and AAVSO sequence team member.

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