longitude

As an adjective zonal

is divided into zones.

As a noun longitude is

angular distance measured west or east of the prime meridian.

As nouns the difference between northing and longitude

is that northing is (cartography) the distance north of a standard reference latitude while longitude is angular distance measured west or east of the prime meridian.

As nouns the difference between longitude and zenith

is that longitude is angular distance measured west or east of the prime meridian while zenith is zenith.

As nouns the difference between longitude and latitudes

is that longitude is angular distance measured west or east of the prime meridian while latitudes is .

As nouns the difference between longitude and vertical

is that longitude is angular distance measured west or east of the prime meridian while vertical is a vertex or zenith.

As an adjective vertical is

along the direction of a plumbline or along a straight line that includes the center of the earth.

As nouns the difference between longitude and colatitude

is that longitude is angular distance measured west or east of the prime meridian while colatitude is the complement, in spherical coordinates, of a latitude (the difference between a latitude and 90°).

As nouns the difference between longitude and transverse

is that longitude is angular distance measured west or east of the prime meridian while transverse is anything that is transverse or athwart.

As an adjective transverse is

situated or lying across; side to side, relative to some defined "forward" direction.

As a verb transverse is

to overturn; to change.

In archaic terms the difference between horizontal and longitude

is that horizontal is pertaining to the horizon while longitude is length.

As nouns the difference between horizontal and longitude

is that horizontal is a horizontal component of a structure while longitude is angular distance measured west or east of the prime meridian.

As an adjective horizontal

is perpendicular to the vertical; parallel to the plane of the horizon; level, flat.

As nouns the difference between longitude and longevity

is that longitude is angular distance measured west or east of the prime meridian while longevity is the quality of being long-lasting, especially of life.

As an adjective linear

is linear (in mathematics, of first-degree polynomial).

As a noun longitude is

angular distance measured west or east of the prime meridian.