prime vertical
Britishnoun
Example Sentences
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The transit instrument is also used in the prime vertical for the determination of latitudes.
From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various
If your A.M. sight was taken when the sun was on or near the prime vertical, a change in latitude at noon will make no change in longitude.
From Lectures in Navigation by Draper, Ernest Gallaudet
The usual observations made by navigators at sea consist in a meridian observation of the sun for latitude, and a morning and possibly afternoon observation of the sun near the prime vertical for longitude.
As the sun, in North latitudes, passes the prime vertical before sunrise in the winter, the following remarks do not hold for that season.
From Lectures in Navigation by Draper, Ernest Gallaudet
Sun Sight In order to make this a valuable sight for longitude it should be taken when the sun is on or as near as possible to the prime vertical.
From Lectures in Navigation by Draper, Ernest Gallaudet
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