Definition:Terrestrial Longitude/Also known as

Terrestrial Longitude: Also known as

Terrestrial longitude is usually known in common parlance as just longitude.

However, this term also encompasses other measurements of longitude, for example celestial longitude and galactic longitude.

Hence on $\mathsf{Pr} \infty \mathsf{fWiki}$ the full term terrestrial longitude is preferred, so as to forestall ambiguity, unless the context is clear.

Sometimes you see the (terrestrial) longitude reported as east (or west) from (or of) Greenwich.

Sources

• 1933: D.M.Y. Sommerville: Analytical Conics (3rd ed.) ... (previous) ... (next): Chapter $\text I$. Coordinates: $2$. Coordinates
• 1976: W.M. Smart: Textbook on Spherical Astronomy (6th ed.) ... (previous) ... (next): Chapter $\text I$. Spherical Trigonometry: $4$. Terrestrial latitude and longitude.
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): longitude: 1.
• 2008: Ian Stewart: Taming the Infinite ... (previous) ... (next): Chapter $6$: Curves and Coordinates: Coordinate geometry today
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): longitude