Bài 7: Latitude and Longtitude

Lesson 7: Latitude and Longtitude


When looking at a map, latitude lines run horizontally. Latitude lines are also known as parallels since they are parallel and are an equal distant from each other. Each degree of latitude is approximately 69 miles (111 km) apart; there is a variation due to the fact that the earth is not a perfect sphere but an oblate ellipsoid (slightly egg-shaped). To remember latitude, imagine them as the horizontal rungs of a ladder ("ladder-tude"). Degrees latitude are numbered from 0° to 90° north and south. Zero degrees is the equator, the imaginary line which divides our planet into the northern and southern hemispheres. 90° north is the North Pole and 90° south is the South Pole.


Latitude (n.) Vĩ tuyến
Horizontal (adj, n.): ngang, nằm ngang, mặt ngang
Horizontal plane: mặt phẳng nằm ngang
Variation (n.): thay đổi, sai biệt
Oblate (adj.): dẹt (hai đầu)
Ellipsoid (n.) (hình) khối cầu elip
The earth is an oblate sphere (Trái đất là một hình cầu dẹt hai đầu)
Equator (n.) Xích đạo
An imaginary circle around the middle of the Earth that is the same distance from the North Pole and the South Pole
The equator - the imaginary line divides our planet into the northern and southern hemispheres


The vertical longitude lines are also known as meridians. They converge at the poles and are widest at the equator (about 69 miles or 111 km apart). Zero degrees longitude is located at Greenwich, England (0°). The degrees continue 180° east and 180° west where they meet and form the International Date Line in the Pacific Ocean. Greenwich, the site of the British Royal Greenwich Observatory, was established as the site of the prime meridian by an international conference in 1884.


Longtitude (n.) kinh tuyến
Vertical (adj, n.): đứng, theo chiều đứng
Meridian (n.): đường kinh tuyến
ex: Any one of the lines that go from the North Pole to the South Pole on maps of the world
Prime meridian: Đường kinh tuyến trung ương, đường kinh tuyến gốc
Converge (v.) Hội tụ, đồng qui
the International Date Line in the Pacific Ocean: đường đổi ngày quốc tế
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