1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Distance of the moon, accoring to Ptolemy

  1. Jan 27, 2012 #1
    The Wikipedia article on the moon says ithat "Ptolemy (90–168 AD)" calculated the distance of the moon as 59 times the Earth's radius and a diameter, which is about the modern value.

    But Wikipedia doesn't say how Ptolemy did that.

    An article at http://www.eso.org tells how to calculate the moon's distance on the basis of the moon's apparent position, from two different locations on earth, during a solar eclipse, but it seems likely Ptolemy did not use this method.

    Does anyone know how Ptolemy, some 2,000 years ago, might have calculated the distance to the moon? Just wondering . . .
    Last edited by a moderator: Jan 27, 2012
  2. jcsd
  3. Jan 27, 2012 #2


    Staff: Mentor

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Distance of the moon, accoring to Ptolemy
  1. The moon (Replies: 11)

  2. The moon (Replies: 25)

  3. Moon's orbit (Replies: 6)

  4. Turning the Moon (Replies: 3)

  5. Recharging at Moon (Replies: 10)