Both the Tropic of Capricorn and the Antarctic Circle are located in the Southern Hemisphere.

Here's why:

* Tropic of Capricorn: This imaginary line circles the Earth at approximately 23.5 degrees south latitude. It marks the southernmost point where the sun can be directly overhead at noon.

* Antarctic Circle: This imaginary line circles the Earth at approximately 66.5 degrees south latitude. It defines the southernmost point where the sun can remain above the horizon for 24 hours during the summer solstice.

Since both lines are located south of the equator, they are in the Southern Hemisphere.