Part of a series which began with Fake news and the ethics of belief.
On 22 December 1870 there was a total solar eclipse.
A solar eclipse is when the moon passes between the earth and the sun, wholly or partially blocking out the sun as viewed from earth.
A total solar eclipse is a rare event, and even then its totality is only visible across a narrow band on the earth’s surface.
On 22 December 1870 the narrow band included parts of Portugal, Spain, Algeria, Sicily, Greece, Bulgaria and Ukraine.
The British Royal Astronomical Society organised an expedition to observe and record the eclipse.