standard meridian

standard meridian

[′stan·dərd mə′rid·ē·ən] (geodesy) The meridian used for reckoning standard time; throughout most of the world the standard meridians are those whose longitudes are exactly divisible by 15°. (mapping) A meridian of a map projection along which the scale is as stated.

standard meridian

standard meridiani. The Greenwich meridian and every meridian divisible by 15, such as 15°, 75°, and 135°.
ii. One or more meridians on a map projection, along which the scale is as stated.