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Using a watch and the sun as a compass: Image title: Illustration of a method to identify north and south directions using the sun and a 12-hour analogue clock or watch set to the local time, for both northern and southern hemispheres, with and without daylight saving, by CMG Lee. Width: 100%: Height: 100%
If the watch is set to uncorrected solar time, both hands point to the sun. In a 12-hour watch, the sun and the hour hand both advance, but not at the same rate; the sun covers 15 degrees per hour, and watch 30. To keep the hour hand on the sun, 12:00 must recede from the zenith at the same rate the hour hand advances.
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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To use the compass, the base plate is first levelled with the horizon and then pointed roughly to what the user believes to be north. The equatorial drum is then tilted in relation to this base according to the local latitude. The sights are then set using the local hour angle and the declination of whatever astronomical body is being used ...
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