Change of programme: The Tangled History of the Cepheid Period–Luminosity Relation – Dr Robert Smith

February 7, 2015 @ 7:30 pm – 10:00 pm
Willingdon Memorial Hall
Eastbourne, East Sussex BN20 9HT
The Tangled History of the Cepheid Period-Luminosity Relation – Dr Robert Smith – Emeritus Reader in Astronomy, University of Sussex

A historical account of how the period-luminosity relation we know today as a key step on the distance ladder came to be calibrated, showing all the cancelling errors along the way. It starts with an account of how we measure distances, to explain how the calibration of the luminosity should be done, continues with how the calibration was actually done (wrongly) for many years, and ends with a moral (well, two actually). 
Note: Gamma-ray Bursts and the Early Universe by Prof. Nial Tanvir, Univ. of Leicester has been replaced by the above lecture due to a family bereavement.

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