science

posted by .

how were the latitudes of the tropic of cancer, tropic of capricorn, Arctic circle, and Antarctic circle determined?

  • science -

    They were determined by people with sextants and chronometers measuring the height of the sun at noon.

    DO a search for "The history of the sextant"

    Arctic Circle: It is light 24 hours a day north of the Arctic Circle (66.5 degrees north) on the June Solstice. The sun at noon is 43 off zenith.

    Tropic of Cancer: On the June Solstice the sun is directly overhead the Tropic of Cancer (23.5 degrees north latitude) at noon.

    Equator: At the equator (zero degrees latitude), the day is always 12 hours long. At the equator, sun rises daily at 6 a.m. local time and sets at 6 p.m. local time. The sun at noon at the equator is 23.5 degrees off the zenith.

    Tropic of Capricorn: The sun is low in the sky, at 47 degrees from zenith (23.5 plus 23.5).

    Antarctic Circle: At the Antarctic Circle (66.5 degrees south), the sun makes the briefest of appearances at noon, peeking at the horizon and then instantaneously disappearing. All areas south of the Antarctic Circle are dark on the June Solstice.

    South Pole: By June 21, it has been dark for three months at the South Pole (90 degrees south latitude. The sun set at the South Pole on The September Equinox.


    September Equinox (approximately September 22-23)
    This day begins fall in the Northern Hemisphere and spring in the Southern Hemisphere. There are twelve hours of daylight and twelve hours of darkness at all points on the earth’s surface on the two equinoxes. Sunrise is at 6 a.m. and sunset is at 6 p.m. local (solar) time for most points on the earth’s surface.

    North Pole: The sun is on the horizon at the North Pole on the September Equinox in the morning. The sun sets at the North Pole at noon on the September Equinox and the North Pole remains dark until the March Equinox.

    Arctic Circle: Experiences 12 hours of daylight and 12 hours of darkness. The sun is 66.5 degrees off of the zenith or 23.5 degrees above the horizon.

    Tropic of Cancer: Experiences 12 hours of daylight and 12 hours of darkness. The sun is 23.5 degrees off of the zenith.

    Equator: The sun is directly overhead the equator at noon on the equinox. On both equinoxes (which means "equal nights" in Latin), the sun is directly over the equator at noon.

    Tropic of Capricorn: Experiences 12 hours of daylight and 12 hours of darkness. The sun is 23.5 degrees off of the zenith.

    Antarctic Circle: Experiences 12 hours of daylight and 12 hours of darkness.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physical geography

    How many miles are between the tropics of cancer and capricorn if you travel directly north and south?
  2. geography

    name the major line north of the equator The Tropic of Cancer. In the future, you might want to post both questions at the same time, in the same post. No need to create two separate threads on Geography. tropic of cancer Another major …
  3. geography

    How many degrees of latitude and longitude separate a location at the intersection of the international date line and the antarctic circle from another location at the intersection of the prime meridian and the tropic of cancer?
  4. science

    what do the tropic of capricon, tropic of cancer lines, artic, an antartic circles represent?
  5. geography

    I do not mean to make it seem I an unappreciative for the help but can you look over my question again. Is Mexico City north or south of the Tropic of Capricorn?
  6. georaphy

    Can you help? Is the Arctic Circle north or south of the Tropic of Capricorn?
  7. geography

    Is this correct? 1.The prime meridian passes through both the north and south pole. 2. The Tropic of Cancer is to the Tropic of Capricorn as the Arctic Circle is to the Antarctic Circle?
  8. 7th grade social studies Ms. Sue please

    1. While Earth's orbit around the sun takes roughly 365 days, a single rotation of Earth takes about (1 point) 8 hours. 24 hours. 1 month. 12 months. 2. During the summer solstice in the United States, the ______ _______ is tilted …
  9. social studies

    Multiple Choice 1. While Earth's orbit around the sun takes roughly 365 days, a single rotation of Earth takes about 8 hours. 24 hours. 1 month. 12 months. 2. During the summer solstice in the United States, the ______ _______ is tilted …
  10. Geography and Society

    Which of the following areas receive the LEAST amount of precipitation?

More Similar Questions