Points on that meridian are called freezing points,
especially where it crosses water.
prime meridrian
0 longitude is the prime meridian. 0 latitude is the equator.
The Prime Meridian
Absolute zero.
It is called absolute location.
The official unit for temperature in the SI - the currently used version of the metric system - is the Kelvin. In popular usage, the degree Celsius, a.k.a. degree Centigrade, is more common; the Kelvin is used a lot in science.
I'm having a little with trouble converting Centigrade to Fahrenheit. Centigrade is an older name for Celsius.
Centigrade was the old name for the Celsius system. It is exactly the same thing under a new name.
The Fahrenheit equivalent to zero degrees Centigrade is 32. Centigrade is another name for Celsius, and zero Celsius is the same as zero centigrade.
centigrade
In terms of geography, 0 degrees longitude is known as the Prime Meridian. 0 degrees latitude is the equator.
Celsius. Celsius.