The Cancer Tropic is now located roughly 23.4 degrees north of the Equator. Capricorn's Tropic is located 23.4 degrees south of the Equator. The circle with radius 6900 miles covers all parts of Earth's surface except for the Arctic and Antarctic Regions.
The Tropics refer to the region between the Tropics of Cancer and Capricorn. They are the only region on Earth where days are always long, but nights can be very short or even longer than days. The term "Tropical" may mislead you into thinking that these regions have extremely high temperatures all the time, but this is not true; in fact, they have some of the lowest average temperatures on Earth.
The Tropics include all tropical zones, from the equatorial zone to about 20 degrees north or south of it. All islands in the tropics are within these limits, as well as most of mainland tropical Africa, Asia, Australia, and South America. However, many places that seem like they should be in the tropics aren't because they're too far from the equator or located in a polar region.
In addition to having long days and short nights, the tropics also experience four distinct seasons. The climate varies depending on the position relative to the equator, with more or less constant temperature throughout the year. In the equatorial region, there is no difference between the seasons because there is no variation in altitude above sea level.
Aside from the equator (0 degrees), the North Pole (90 degrees North), and the South Pole (90 degrees South), there are four notable latitude parallels: I the Cancer Tropic (23 1/2 deg N) in the Northern Hemisphere. (ii) the Tropic of Capricorn (23 1/2 deg S) in the Southern Hemisphere. (iii) the Arctic Circle (66 deg N) (iv) the Antarctic Circle (90 deg S).
These are the only two parallel lines on the surface of the Earth's crust. The others are either vertical or inclined slightly toward the center of the planet.
The name "Tropic" comes from the Greek for "turning point". The Cancer and Capricorn tropics lie within a circle centered on the Earth's axis of rotation, which passes through both poles. These circles divide the globe into two nearly identical hemispheres.
During each year, the Earth travels around the Sun at a constant speed. But because it is spinning around its axis, each place on the surface experiences different amounts of daylight and darkness. Day follows night everywhere on Earth except at the two points directly opposite one another: the poles. Here, all points experience the same amount of daylight and darkness every day. This is why the polar regions always appear to be daytime during the summer and nighttime during the winter.
The Tropic of Cancer is located at 23d 26' 22" north of the Equator and is the highest northerly latitude where the sun may be seen directly above at midday. The line runs through Mumbai, India.
The word "tropic" comes from Greek τρόπος tropos meaning "turning point" or "pole". Thus, a tropic is a point on the earth where the earth's axis of rotation meets its surface.
The term "tropical zone" is often used to describe the part of each hemisphere that surrounds a tropic. Tropical zones are characterized by their average temperature, which is above 18 degrees Celsius (64 degrees Fahrenheit).
Areas within 30 degrees of the equator have the same daytime heat around the world, so they're called tropical zones. Areas with less heat are called temperate zones, and areas with very cold temperatures are called polar regions.
Around the world, there are two tropical zones, one in each hemisphere. They overlap but don't touch. The area between them is called the intertropical convergence zone. This is the region where most tropical cyclones form. Cyclones are large storms with rotating winds that originate in this region.
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