Friday 31 July 2020

Sunspots seen from Manchester in 1870

Sunspots Seen from Manchester 1870

Mr Henry Ormesher of Manchester writes that -

“On the 31st July 1870 while looking at sunspots with my 3 inch refractor, I saw a beautiful cluster of spots, occupying an almost central position on the disc. It occurred to me that the umbra in the largest spot appeared more dense on the eastern side. I therefore determined to examine it with my 5.25 inch refractor; I did so using a power of 181. The result was, that it resolved itself into a very fine nucleus of a somewhat oval shape. After making myself sure that this was the case, I examined the cluster, and was struck with the beautiful appearance of the brighter part of the Sun’s atmosphere. A very bright stream ran across the cluster in a zigzag direction, separating the penumbra. Some parts of this stream, particularly the upper part, appeared brighter than others, presenting a very mottled appearance”

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