The city closest to the Tropic of Cancer is San Diego, California. The Tropic of Cancer is located at approximately 23.5 degrees north latitude, and San Diego is situated just slightly south of this line. Other cities near the Tropic of Cancer include Phoenix, Arizona, and Las Vegas, Nevada, but San Diego is often recognized for its proximity and coastal location.
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The Tropic of Cancer passes through the city limits of Todos Los Santos, in Baja California south of La Paz.
The coastal and tourist resort of Mazatlan qualifies as such (coordinates: 23.22, -106.42)
The city of Rockhampton in Australia lies closest to the Tropic of Capricorn, running through the city and earning it the title of the "Tropic of Capricorn City."
There are no national, state, or provincial capitals directly on the Tropic of Cancer. The closest national capital is Muscat (Masqat) in Oman, which is about 12 miles north of the latitude line, near 23.6°N 58.5°E. The next closest is Havana, Cuba near 23.1°N 82.4°W, about 20 miles south of the line.
The Australian east coast city closest to the Tropic of Capricorn is Rockhampton. A monument marking the Tropic of Capricorn is located just South of the city.
It's south from the Tropic of Cancer
The closest line of latitude to Mexico City is the Tropic of Cancer, at 30 degrees north. Mexico City itself is close to 19° N.
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The Tropic of Cancer is an imaginary complete circle around the Earth, parallel to the equator and 23.5 degrees north of it everywhere. The Tropic has no beginning or end.