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    Re: Impossible lunar example
    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.

    =============================
    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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