Frigid
tropical
The equator is at 0 degrees latitude.
0 degrees latitude is the Equator.
The Equator is at 0 degrees latitude. The South Pole is at the centre of the Southern Hemisphere. The South Pole is at 90 degrees S latitude. Every line of latitude between 0 and 90 S are in the Southern Hemisphere.
The sun's rays are strongest at 0 degrees latitude.
tropical
The equator is at 0 degrees latitude.
0 degrees longitude
The zero (0) degrees of latitude is the Equator.
0 degrees latitude is the Equator.
The prime meridian is a line at 0 degrees longitude.
The equator is at 0 degrees latitude.
The Equator is 0 degrees latitude, and the Prime (or Grenwich) Meridian is 0 degrees longitude.
longitude
The Equator is at 0 degrees latitude. The South Pole is at the centre of the Southern Hemisphere. The South Pole is at 90 degrees S latitude. Every line of latitude between 0 and 90 S are in the Southern Hemisphere.
The Prime Meridian is defined as zero longitude, in whatever unit you like to express angles.
The Equator is at 0 degrees latitude.