What are longitude and longitude measured in?

Answer 1

they are measured in degrees

Answer 2

Longitude is an angle, and is expressed in angle units. Some meridians are often

drawn on maps to show the location of a few selected longitudes, but there's no

need to measure those lines.

Answer 3

"Declination" may refer to one of the two celestial location coordinates,

analogous to terrestrial latitude, or to the error in the reading of a magnetic

compass. Both of these quantities are angles, and are described in angle units.

Answer 4

Usually degrees. However latitude can potentially be measured in any unit that angles are measured in (e.g. radians, grads, binary degrees, minutes, seconds, turns, quadrants).