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cosmology - How do you calculate comoving distance and light's travel distance? According to the formulae below? - Astronomy Stack Exchange
![John Wise on Twitter: "Maybe the most useful cosmology chart has been updated for Planck 2018. If you haven't seen this already, introducing the pencil and paper cosmology calculator by Sergei Pilipenko John Wise on Twitter: "Maybe the most useful cosmology chart has been updated for Planck 2018. If you haven't seen this already, introducing the pencil and paper cosmology calculator by Sergei Pilipenko](https://pbs.twimg.com/media/EwCgcU9XEAMSVat.png)
John Wise on Twitter: "Maybe the most useful cosmology chart has been updated for Planck 2018. If you haven't seen this already, introducing the pencil and paper cosmology calculator by Sergei Pilipenko
GitHub - coolastro/pyCOSMOCAL: Ned Wright Cosmology Calculator [http://www.astro.ucla.edu/~wright/CosmoCalc.html] with Graphic User Interface
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observational astronomy - How do you calculate the lookback time distance to a given galaxy? - Astronomy Stack Exchange
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