A system of geographical coordinates is necessary in order to accurately determine the location of an object on the surface of the Earth. As you know, this system consists of geographical latitude and longitude. The first element from this system is the angle between the local zenith (noon) and the equatorial plane, representing a value from 0 to 90 degrees to the west or east of the equatorial boundary. Longitude is the angle formed by two planes: the meridian passing through a given point of the terrain and the Greenwich meridian, i.e. zero point. From the last begins the counting of longitude, which is a value from 0 to 180 degrees east and west (east and west longitude). Knowing how to navigate the area using the determination of latitude and longitude will help to inform your exact coordinates when an emergency occurs, when you find yourself in an unfamiliar place that is not indicated on the map, or get lost in the forest. You can find out more about how you can determine the latitude and longitude of your location.Clock for determining the location in width and longitude
How to determine a place by latitude and longitudeLocate a place by latitude and longitude using a watch
Local geographic longitude is determined using a conventional clock. To do this, it is necessary to establish on them the exact time of the location at the moment. Then you should determine the time of local noon, a time-tested method will help: you need to find a meter or one and a half meter stick, stick it vertically into the ground. The length of the line of the falling shadow will indicate the time intervals that need to be detected. The moment when the shadow will be the shortest is the local zenith, i.e. the gnomon shows exactly 12 o'clock in the afternoon, while the direction of the shadow is from south to north.
At this time, you need to track the time on the clock - this will be an indication of the average Greenwich time. From this value you need to subtract the indicator, which is taken from the table of the equation of time. This correction arises from the inconsistency of the angular velocity of motion and the dependence on the time of year. Given this correction, the average Greenwich time is reduced to true solar. The resulting difference between this solar time (i.e. 12 hours) and Greenwich time, taking into account the amendment, must be converted to a degree value. To do this, you need to know that in one hour the Earth rotates 15 degrees (if you divide 360 degrees by 24 hours) longitude, or 1 degree in four minutes. If noon in a given area occurs earlier than Greenwich, in your calculations indicate the east longitude, if later, then the west. The closer the coordinates of the desired area to the polar regions, the more accurate will be the measurement of longitude.
Find a place by longitude and latitude
The field of how the value of longitude is found, you can begin to determine the latitude value of a particular area. First you need to determine the duration of the daytime, which begins with sunrise and ends with sunset. Next, you need to make a nomogram, i.e. definition of latitude: on the left side the value of the length of daylight hours is indicated, in the right - the date. If you combine these values, you can determine the intersection of geographical latitude with the middle part. The location found will indicate the local latitude. When determining latitude relative to the southern hemisphere, it is necessary to add 6 months to the required date. The second way is to find the latitude using a conventional protractor: for this, a plumb line (thread with a small weight) is fixed in the center of this tool, and its base is pointed at the North Star. The angle formed by the plumb and the base of the protractor must be reduced by 90 degrees, i.e. subtract this value from its value. The value of this angle indicates the height of the North Star, i.e. the height of the pole above the horizon. Since the latitude is equal to the magnitude of the pole above the horizon of a particular place, this value will indicate its degree.