Tropic of Cancer
The Tropic of Cancer, also referred to as the Northern Tropic, is currently 23°26′13.2″ (or 23.43701°) north of the Equator. It is the most northerly circle of latitude on Earth at which the Sun can be directly overhead. This occurs on the June solstice, when the Northern Hemisphere is tilted toward the Sun to its maximum extent.
Its Southern Hemisphere counterpart, marking the most southerly position at which the Sun can be directly overhead, is the Tropic of Capricorn. These tropics are two of the five major circles of latitude that mark maps of Earth, besides the Arctic and Antarctic Circles and the Equator. The positions of these two circles of latitude (relative to the Equator) are dictated by the tilt of Earth's axis of rotation relative to the plane of its orbit.
When this line of latitude was named some 2,000 years ago, the Sun was in the constellation Cancer (Latin for crab) at the June solstice, the time each year that the Sun reaches its zenith at this latitude. Due to the precession of the equinoxes, this is no longer the case; today the Sun is in Taurus at the June solstice. The word "tropic" itself comes from the Greek "trope (τροπή)", meaning turn (change of direction, or circumstances), inclination, referring to the fact that the Sun appears to "turn back" at the solstices.
The Tropic of Cancer's position is not fixed, but varies in a complicated manner over time. Currently, it gradually drifts south almost half an arcsecond (0.47″) of latitude, or 15 metres, per year (it was at exactly 23° 27′ in 1917 and will be at 23° 26' in 2045). See axial tilt and circles of latitude for further information.
North of the tropic are the subtropics and the North Temperate Zone. The equivalent line of latitude south of the Equator is called the Tropic of Capricorn, and the region between the two, centered on the Equator, is the tropics.
Starting at the prime meridian and heading eastward, the Tropic of Cancer passes through 16 countries:
Excluding cooler highland regions in China, the climate at the Tropic of Cancer is generally hot and dry except for easterly coastal areas where orographic rainfall can be very heavy, in some places reaching 4 metres (160 in). Most regions on the Tropic of Cancer experience two distinct seasons: an extremely hot summer with temperatures often reaching 45 °C (113 °F) and a warm winter with maxima around 22 °C (72 °F). Much land on or near the Tropic of Cancer is part of the Sahara Desert, whilst to the east the climate is torrid monsoonal with a short wet season from June to September and very little rainfall for the rest of the year.
The highest mountain on or adjacent to the Tropic of Cancer is Yushan in Taiwan; though it had glaciers descending as low as 2,800 metres (9,190 ft) during the Last Glacial Maximum, none survive and at present no glaciers exist within 470 kilometres (290 mi) of the Tropic of Cancer; the nearest currently surviving are the Minyong and Baishui in the Himalayas to the north and on Iztaccíhuatl to the south.
According to the rules of the Fédération Aéronautique Internationale, for a flight to compete for a round-the-world speed record, it must cover a distance no less than the length of the Tropic of Cancer, cross all meridians, and end on the same airfield where it started.
Length of the Tropic on 11 December 2015, at 23°26′14″N is 36,788 kilometres (22,859 mi).
For an ordinary circumnavigation the rules are somewhat relaxed and the distance is set to a rounded value of at least 36,770 kilometres (22,850 mi).
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- Article on the Tropic of Cancer in Oman
- Temporal Epoch Calculations
- Useful constants See: Obliquity of the ecliptic
- 23rd parallel north
- 24th parallel north
- Tropic of Capricorn
- Antarctic Circle
- Arctic Circle
- Axial tilt
- Milankovitch cycles
- Ducking and shaving
- "PHP Science Labs". Retrieved 2014-01-01.
- Montana State University: Milankovitch Cycles & Glaciation Archived August 6, 2011, at the Wayback Machine.
- RhumbSolve online rhumb line calculator.