Hosted by our Director, Avivah Yamani.

Explore the story behind astronomical magnitude, from Hipparchus and Ptolemy to modern photometry, and learn why brighter stars have smaller numbers.

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The 365 Days of Astronomy Podcast is produced by the Planetary Science Institute. http://www.psi.edu

Visit us on the web at 365DaysOfAstronomy.org or email us at info@365DaysOfAstronomy.org.