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  1. #1
    Andy G's Avatar
    Andy G Guest

    Default Equinox Star Party



    Anyone going??

    Cheers

    Andy

    Mr Andrew R Green B.Sc(Hons) FRAS.



  2. #2
    oriel36's Avatar
    oriel36 Guest

    Default Equinox Star Party

    On Sep 4, 12:19 am, "Andy G" <astronom...@ntlworld.com> wrote:

    The solar radiation /orbital shadow boundary pivots off the
    Equator,that is why you have basically a constant symmetry between
    daylight and darkness over the course of an annual orbit at the
    Equator.

    Instruct those present at the star party that at the Equinox the
    solar radiation/orbital shadow boundary splits the polar axis rather
    than the usual false description based on the pseudo-dynamic of
    variations in axial tilt by which you normally explain solstices and
    equinoxes -

    http://imagine.gsfc.nasa.gov/docs/as...s/980211f.html

    Divorced from the solstices,the Equinoxes are a truly global
    astronomical event (solstices are hemispherical in nature) for many
    enjoyable reasons.The Wikipedia image is the only one I know of that
    accurately shows the latitudinal change in the solar radiation/orbital
    shadow boundary ,at least how it pivots off the Equator and as it
    applies to the Equinox -

    http://upload.wikimedia.org/wikipedi...easonearth.png







 

 

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