Question

what is the longest latitude ?​

Answer 1

Answer:

The Equator is the longest circle of latitude and is the only circle of latitude which also is a great circle.

Answer 2

Equator

The equator is centred at a latitude of 0 degrees, meaning it is centred at the earth's circumference. As u know the sphere is the shape of the earth, that's why the equator is the longest latitude line.

Hope it's helpful... ^_^