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Letters on Astronomy - Olmsted, Denison
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"[...] A section of a sphere, by a plane cutting it in any manner, is a circle. Great circles are those which pass through the centre of the sphere, and divide it into two equal hemispheres. Small circles are such as do not pass through the centre, but divide the sphere into two unequal parts. The axis of a circle is a straight line passing through its centre at right angles to its plane. The pole of a great circle is the point on the sphere where its axis cuts through the sphere. Every great circle has two poles, each of ...

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Letters on Astronomy 2018, Outlook Verlag

ISBN-13: 9783732687299

Trade paperback

Letters on Astronomy 2018, Outlook Verlag

ISBN-13: 9783732687305

Hardcover

Letters on Astronomy 2009, BiblioLife

ISBN-13: 9781117507996

Trade paperback

Letters on Astronomy 2009, BiblioLife

ISBN-13: 9781117507989

Hardcover