Tuesday, August 15, 2017

Delineating the Eclipse

detail from delineation of eclipse showing local time199 years ago, here in Hanover, a student displayed his mastery over mathematics and astronomy by delineating a solar eclipse as it would appear in Hanover on August 27, 1821. Unlike the total eclipse North America will experience next week, it was an annular eclipse, so there would have been a ring of fire around the moon as it almost blocked out the sun.

Document illustrating the angle of the eclipseBut like the eclipse next week, the one in 1821 would have only been a partial eclipse here in Hanover. The full force of it cut across the southern states as it moved out into the Atlantic. Event here in the North, it still provided a teachable moment that required computational and drafting skill. In this particular case, it was also an excuse to show off impeccable handwriting.

Detail of delineation of eclipse giving attribution to Nathaneal Cogswell
To view this solar eclipse, you don't have to travel far, just ask for MS 818416.1.

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