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Lights all askew in the Heavens – the 1919 Eclipse Expeditions

I completely forgot to upload the slides from my talk at the Open Meeting of the Royal Astronomical Society on April 12 2019 so here they are now!

Just a reminder that the centenary of the famous 1919 Eclipse Expeditions is on 29 May 2019.

This entry was posted on April 23, 2019 at 9:44 am and is filed under History, Talks and Reviews, The Universe and Stuff with tags , , , , , . You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

2 Responses to “Lights all askew in the Heavens – the 1919 Eclipse Expeditions”

  1. cormac Says:
    April 23, 2019 at 11:22 am

    Could you explain how light-bending in a gravitational field is predicted in Newtonian physics? I don’t understand the Soldner calculation for a particle of zero mass
    P.S. The photo of Einstein and Edd is from 1930!

    Reply
    • telescoper Says:
      April 23, 2019 at 11:30 am

      That’s a point I made in the talk – it’s anyone’s guess what happens if the photon is actually massless but if it has a non-zero but vanishingly small mass it’s calculable.

      Of course if you use E=mc^2 then you have a justification but that’s equivalent to just using the time-time component of the field equation, i.e. it ignores the space-space component.

      Reply

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