Archive for May 12, 2019

The Observer and the Eclipse

Posted in Books, Talks and Reviews, History, The Universe and Stuff with tags , , on May 12, 2019 by telescoper

Not surprisingly, given that the centenary is fast approaching, pieces are appearing in the mainstream media about the 1919 Eclipse Expeditions that first measured the deflection of light by the Sun’s gravitational field. One such article, by Robin McKie, appears in today’s Observer. It’s a nice piece, though it concentrates almost entirely on Eddington’s measurements taken at Principe. In fact it was Crommelin’s measurements from Sobral that proved decisive.

Anyway, the article gives me a (very brief) mention courtesy of the piece I wrote in Nature a few weeks ago:

For many years at Cardiff I ran an undergraduate project in which the students had to reanalyze the measurements from the eclipse expeditions. That is possible because all the necessary star positions are tabulated in the paper by Dyson et al. (1920). It is undoubtedly the case that Eddington had to improvise a bit because of the unexpected problems that arose in the field, but this is actually quite normal. As a famous general put it `No plan of battle survives first contact with the enemy’. I remain convinced that Eddington didn’t do anything dodgy, but you don’t have to take my word for it: if you don’t believe me then go ahead and look at the data yourself! At the very least you will then understand what a difficult experiment this was!

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