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Navis.gr - Latitude and Longitude (2245 words) |
 | Longitude is seen to be a measure of the angle between the planes of two meridian circles, one of which is the prime meridian. |
| Lines of longitude are numbered east of the prime meridian from 0 to 180 east longitude and west from 0 to 180 west longitude. |
| Before a prime meridian was agreed upon, map makers usually began numbering the lines of longitude on their maps at whichever meridian passed through the site of their national observatory. |
| PM-ESIP - Projections (652 words) |
| Bounding meridians are evenly divisible by 6°, and zones are numbered from 1 to 60 proceeding east from the 180th meridian from Greenwich with minor exceptions. |
| The non-central meridians are drawn from pole to pole, intersecting the meridians at the proper point. |
| Since the spacings on the parallels are proportional to the cosine of the latitude, and since parallels are equally spaced, the meridians form curves which may be called cosine, sine, or sinusoidal curves; hence, the name of the projection. |
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