That would be 45° North latitude.
The Equator
That would be the equator, at zero latitude.
The equator
Tropic of CancerThe Tropic of Cancer.
The Arctic Circle lies between 60 and 70 degrees North. The next major circle of latitude south is the tropic of Cancer.
The Arctic Circle is about 66.5 degrees north latitude. The Tropic of Cancer is about 23.5 degrees north latitude.
The Tropic of Cancer
equator
The Tropic of Cancer is to the Tropic of Capricorn as the Arctic Circle is to the Antarctic Circle. They are lines of latitude either north (Arctic Circle, Tropic of Cancer) or south of the equator.
Well there's the Arctic Circle, Antarctic Circle, Tropic of Cancer, Tropic of Capricorn and the Equator.
The "tropical latitudes" are the latitudes within 23.5 degrees of the equator, both north and south of it. The half of the "tropics" between the equator and the Arctic Circle is the half between the equator and 23.5 degrees north latitude. The line at 23.5 degrees north latitude that marks the northern boundary of the tropics is the "Tropic of Cancer".
Arctic Circle