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(geography, astronomy, countable) The angular distance north or south from a planet's equator, measured along the meridian of that particular point.

Earth's graticule. The vertical lines from pole to pole are lines of constant longitude, or meridians. The circles parallel to the equator are lines of constant latitude, or parallels. The graticule shows the latitude and longitude of points on the surface. In this example meridians are spaced at 6° intervals and parallels at 4° intervals.

(geography) An imaginary line (in the form of a circumference) around a planet running parallel to the planet's equator.

Earth model with circles of latitude in black and indications of the North Pole, Equator, and the northern and southern hemispheres.

(geography, astronomy, countable) The angular distance north or south from a planet's equator, measured along the meridian of that particular point.

A perspective view of the Earth showing how latitude ( ${\displaystyle \phi }$) and longitude ( ${\displaystyle \lambda }$) are defined on a spherical model. The graticule spacing is 10 degrees.