On Sep 4, 12:19 am, "Andy G" wrote:
Anyone going??

Cheers

Andy

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

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