Q re Anticrepuscular rays on the equinox

Q re Anticrepuscular rays on the equinox

Forums The Cloud Forum Q re Anticrepuscular rays on the equinox

Viewing 3 reply threads
  • Author
    Posts
    • #84704
      Catherine Grant avatarCatherine Grant
      Participant

      Hello all,
      Interested to know whether my logic holds up for this question.
      I saw lovely anti-crepuscular rays (here in Phnom Penh, Cambodia) at sunset (about 6:30pm) on 22 September this year.
      I believe the equinox this year was 8:21am 23 September.
      Would this mean that of all days in the year (possibly bar the other equinox!), those rays on the eve of the equinox would have been converging on the point on the horizon that’s closest possible to true “east”?
      (it’d be fun, if so!)
      Thanks!

    • #84721
      Howard Brown avatarHoward Brown
      Participant

      Well, they say fools rush in, so I will vote yes; but I can see from your link why you exercise some caution in posing the question. I guess you could check against the North Star (but is that ‘true’ north) since you seem to be one of the lucky ones with a vista. In suburbia a vista is not what I get.

      And I have never seen anti-crepuscular.

    • #84843
      Andrew Pothecary avatarAndrew Pothecary
      Moderator

      It’s probably easy to work out, but I would ask Eratosthenes.
      https://en.wikipedia.org/wiki/Eratosthenes

    • #84844
      Andrew Pothecary avatarAndrew Pothecary
      Moderator

      It’s probably easy to work out, but I would ask Eratosthenes.
      https://en.wikipedia.org/wiki/Eratosthenes

Viewing 3 reply threads
  • You must be logged in to reply to this topic.