Isn't this incorrect? If it's summer, south of the Tropic of Cancer, the stick should be North of the line. It's the Tropic of Cancer where the sun is overhead,

Isn't this incorrect? If it's summer, south of the Tropic of Cancer, the stick should be North of the line. It's the Tropic of Cancer where the sun is overhead, not at the equator. Or did I understand basic astrophysics wrong. Similarly, in the winters, I'd imagine North of the Tropic of Capricorn would play the role of the Tropic of Cancer.