13 May 2019

Why planets go "retrograde"


Via Neatorama.

Reposted from 2016 to add this convenient diagram:


Planetary orbits as viewed from the earth look like patterns drawn with a Spirograph.  Image via.

See also this very interesting mathematical analysis: The Pentagram of Venus (with a hat tip to an anonymous reader).

2 comments:

  1. cool graphic for venus, showing where the '13' (5+8) comes from:

    https://johncarlosbaez.wordpress.com/2014/01/04/the-pentagram-of-venus/ The Pentagram of Venus

    I-)

    ReplyDelete
    Replies
    1. That's interesting. I moved it to the body of the post. Tx.

      Delete