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A geographical mile is defined to be the length of one minute of arc along the equator (one equatorial minute of longitude) therefore a degree of longitude along the equator is exactly 60 geographical miles or 111.3 kilometers, as there are 60 minutes in a degree. The length of 1 minute of longitude along the equator is 1 geographical mile or 1 ...
The latitude and longitude are expressed in decimal degree notation, in which a positive latitude value refers to the northern hemisphere, and a negative value refers to the southern hemisphere. Similarly, a positive longitude value refers to the eastern hemisphere, and a negative value refers to the western hemisphere.
The first level of GEOREF divides the world into quadrangles each measuring 15 degrees of longitude by 15 degrees of latitude; this results in 24 zones of longitude and 12 bands of latitude. A longitude zone is identified by a letter from A to Z (omitting I and O) starting at 180 degrees and progressing eastward through the full 360 degrees of ...
Originally, many thước of varying lengths were in use in Vietnam, each used for different purposes. According to Hoàng Phê (1988), [1] the traditional system of units had at least two thước of different lengths before 1890, [2] the thước ta (lit. "our ruler") or thước mộc ("wooden ruler"), equal to 0.425 metres (1 ft 4.7 in), and the thước đo vải ("ruler for measuring ...
Buffer zone 220,055 ha (849.64 sq mi) Phong Nha-Kẻ Bàng ( Vietnamese : Vườn quốc gia Phong Nha-Kẻ Bàng ) is a national park and UNESCO World Heritage Site in the Bố Trạch and Minh Hóa districts of central Quảng Bình Province in the North Central Coast region of Vietnam , about 500 km south of Hanoi .
Longitude calculations can be simplified using a clock is set to the local time of a starting point whose longitude is known, transporting it to a new location, and using it for astronomical observations. The longitude of the new location can be determined by comparing the difference of local mean time and the time of the transported clock.
Đồng Tháp is a province in the Mekong Delta and Plain of Reeds region of southern Vietnam.Đồng Tháp is 165 kilometres (103 mi) from Ho Chi Minh City, bordered by Pray Veng province (Cambodia) in the north with a length of more than 48 kilometres (30 mi); Vĩnh Long and Cần Thơ in the south; An Giang in the west; and Long An and Tiền Giang in the east.
Pu Mat Mountain (841 metres (2,759 ft)) is located within the park. It is a national park since November 2001. It has a buffer area covers 86,000 hectares (210,000 acres). It is a lowland evergreen forest with 2,461 plant species. [33] [34] Considered as the flagship park, its location is on the Truong Son Mountains, the northern massif ...