Distance between San Antonio, Texas, USA and the Tropic of Cancer

666 km = 414 miles

During our calculation of the distance to the Tropic of Cancer we make two assumptions:

1. We assume a spherical Earth as a close approximation of the true shape of the Earth (an oblate spheroid). The distance is calculated as great-circle or orthodromic distance on the surface of a sphere.
2. We calculate the distance between a point on the Earth’s surface and the Tropic of Cancer as the length of the arc of the meridian passing through this point and crossing the Tropic of Cancer.

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San Antonio, USA

Country: USA
State: Texas
San Antonio’s coordinates: 29°25′26″ N, 98°29′37″ W
Population: 1,327,407
Find out what time it is in San Antonio right now
Wikipedia article: San Antonio

The Tropic of Cancer

The Tropic of Cancer or Northern Tropic is a circle of latitude or parallel on the Earth's surface where the Sun appears in zenith once a year, at the time of the summer solstice.
For the points on the Earth's surface located between the Tropic of Cancer and the Tropic of Capricorn, the Sun appears in zenith twice a year.
For the points on the Earth's surface located to the north of the Tropic of Cancer and to the south of the Tropic of Capricorn, the Sun never appears in zenith.

The latitude of the Tropic of Cancer depends on the tilt of the Earth's axis which changes with time.
The current latitude of the Tropic of Cancer equals 23°26′16″ N.

Wikipedia article: the Tropic of Cancer