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Equinox Star Party
Anyone going??
Cheers Andy Mr Andrew R Green B.Sc(Hons) FRAS. |
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Equinox Star Party
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 |
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