0° or 0 degrees may refer to: * Longitude: the

prime meridian A prime meridian is an arbitrary meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great c ...

on any planet or moon ** For most of the 20th century on Earth, the prime meridian (Greenwich) ** IERS Reference Meridian, the modern reference meridian for time and global navigation on Earth * Latitude: the

equator The equator is a circle of latitude, about in circumference, that divides Earth into the Northern and Southern hemispheres. It is an imaginary line located at 0 degrees latitude, halfway between the North and South poles. The term can als ...

* freezing point of water (Celsius) *

absolute zero Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin. The fundamental particles of nature have minimum vibration ...

, the lower limit of the thermodynamic temperature scale (Kelvins) * 0 degrees Fahrenheit, approximately -17.78 degrees Celsius

See also