Johannes Fabricius and Sunspots
On March 9th 1611 Johannes Fabricius pointing his
telescope to the rising Sun and saw sunspots. The Sun was very low in the sky
but when he tried to look from the edge of the Sun towards the centre it became
too bright. He then used the projection method of observing the Sun. He then tried to work out the rotation period of the Sun.
Johannes was the son of David Fabricius who in 1596
discovered the first variable star, omicron (Mira) Ceti.
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