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The 15th meridian east forms a great circle with the 165th meridian west. The meridian is the central axis of time zones with the UTC+01:00 offset , including Central European Time [ 1 ] and West Africa Time .
Many western states have borders that are meridians of "longitude west of Washington", that is, west of the legal 1850 meridian through the Old Naval Observatory. However, their present boundaries follow the subsequently surveyed boundary, even when inaccurately marked a few miles (kilometers) east or west of the meridian in the statute.
The meridian 15° west of Greenwich is a line of longitude that extends from the North Pole across the Arctic Ocean, Greenland, Iceland, the Atlantic Ocean, Africa, the Southern Ocean, and Antarctica to the South Pole. The 15th meridian west forms a great circle with the 165th meridian east.
Principal cities: Mexico City, Chicago, Guatemala City, Tegucigalpa, Winnipeg, San José, San Salvador. Belize [18] Canada (Central Time Zone) Manitoba; Nunavut [17] Area between 85th meridian west and 102nd meridian west, except Southampton Island and adjoining islands, and all of Kitikmeot Region; Ontario. West of 90° west [19] Saskatchewan
West Virginia border on the shore of the Tug Fork River near the KY-VA-WV tripoint 36°33′15″N 89°34′17″W / 36.55417°N 89.57139°W / 36.55417; -89 Missouri border on the Mississippi River at the Madrid Bar in the Kentucky Bend
Direction determination refers to the ways in which a cardinal direction or compass point can be determined in navigation and wayfinding.The most direct method is using a compass (magnetic compass or gyrocompass), but indirect methods exist, based on the Sun path (unaided or by using a watch or sundial), the stars, and satellite navigation.
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The main point is to be comfortably west of the western tip of Africa (17.5° W) as negative numbers were not yet in use. His prime meridian corresponds to 18° 40' west of Winchester (about 20°W) today. [1] At that time the chief method of determining longitude was by using the reported times of lunar eclipses in different countries.