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" CHAPTER VII. FINDING THE LONGITUDE BY ASTRONOMICAL OBSERVATIONS. 213. THE longitude of a point on the earth's surface is the angle at the pole included between the meridian of the point and some assumed first meridian. The difference of longitude of any... "
A Manual of Spherical and Astronomy: Embracing the General Problems of ... - Page 317
by William Chauvenet - 1864
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Introduction to Avionics Systems

R.P.G. Collinson - Technology & Engineering - 2002 - 804 pages
...equator to the point. The range of latitude angles is from 0° to 90° North and 0° to 90° South. The longitude of a point on the earth's surface is the angle subtended at the earth's centre by the arc along the equator measured East or West of the prime meridian...
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