The parallel of latitude 23°30′ south of the equator, marking the southern boundary of the tropics; the sun is directly overhead at the winter solstice
Parallel of latitude approximately 23°27 south of the terrestrial Equator. It is the southern boundary of the tropics and marks the southernmost latitude at which the Sun can be seen directly overhead at noon
The southern parallel of declination, approximately 23 degrees 27' from the celestial equator, reached by the sun at its maximum declination, or the corresponding parallel on the earth It is named for the sign of the zodiac in which the sun reached its maximum southernly declination at the time the parallel was so named