NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Douglas Denny
Date: 2010 Sep 2, 05:22 -0700
George,
I think you have to think again.
A spherical angle is the angle between TWO lines subtended from the centre of a sphere - NOT three line subtended from the centre: which then constitutes a solid angle.
A solid angle is subtended from the vertex of a spherical triangle to the centre.
Douglas Denny.
Chichester. England.
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Original Posting:-
Douglas Denny wrote-
"Which might be causing the confusion in the text with Janet Taylor because
spherical angles are not solid angles."
Yes they are. A spherical triangle on the Earth's surface subtends a solid
angle at its centre. That is presumably the solid angle that the Euclid
statement applies to.
George.
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