What is the standard longitude range? What is the longitude range?

Longitude refers to the abscissa of a spherical coordinate system. It is expressed by the angular distance of the auxiliary circle where the point on the sphere is located relative to the auxiliary circle where the coordinate origin is located. Usually refers specifically to the longitude of a geographic coordinate.

In order to distinguish each region of the earth, people marked the meridians with degrees, which is called longitude. In fact, longitude is the angle between the planes in which two meridians are located. Internationally, the meridian that passes through the original site of the Greenwich Observatory in London, the capital of the United Kingdom, is designated as the 0° meridian, also known as the prime meridian.

From the 0° meridian, the east and west are divided into 180°, the east 180° belongs to the east longitude, and it is customary to use "e" as the code, and the west 180° belongs to the west longitude, and it is customary to use "w" as the code. The 180° east longitude and the 180° west longitude coincide on a single meridian, which is the 180° meridian. When interpreting longitude on a map, you should pay attention to:

From west to east, the degrees of longitude from small to large are east longitude; From west to east, the degree of longitude is from large to small, which is west longitude; With the exception of the 0° and 180° meridians, the rest of the meridians can accurately distinguish between east and west longitudes. Different warp threads have different places when. It is earlier in the easterly area and later in the western.

Every 15 degrees of longitude is an hour apart. Important meridians: The meridians caused an international controversy, and it was not until 1953 that Greenwich chose the 20°W and 160°E meridians as the boundaries between the eastern and western hemispheres.

The longitude is in Greenwich, London.

is 0 degrees of longitude, and he takes east as east longitude? degree, west for west longitude? Degree. Every 15° time difference is one hour.

The longitude range is 0-180° and the latitude range is 0-90°.

Longitude: 180° from the prime meridian (0° meridian) to the left and right, and the left of the 0° meridian is the west longitude, that is, the left is large and the right is the west longitude, and the reverse is the east longitude.

Latitude: 90° from the equator (0° parallel) to north and south, and the 0° latitude is north latitude upwards, that is, the upper and lower are north latitudes, and vice versa is southern latitudes.

Method of identifying the direction of latitude and longitude:

First of all, you have to find out the location of the North Pole according to the latitude distribution characteristics on the graticule map, and the North Pole is on the north and south along the meridian, and the left west and right east along the latitude. If the north pole is below, follow the meridian line to the south to the north, and follow the latitude line left east and right west.

The vertical line (ray) is the meridian line, and the meridian line indicates the north and south, so the north and south are judged along the meridian; The direction of a point on the same meridian is the relationship between true north and south. Those who are close to the North Pole are in the north, and vice versa are in the south.

Horizontal line (arc line....circle) is the line of latitude, and the line of latitude indicates the east and west, so the east and west are judged along the line of latitude; The direction of a point on the same parallel is the relationship between due east and west. Generally, on the graticule diagram, along the inferior arc latitude line is reversed from east to west.

The longitude range is 0-180° and the latitude range is 0-90°.

From the 0° meridian, the east and west are divided into 180°, the east 180° belongs to the east longitude, and it is customary to use "e" as the code, and the west 180° belongs to the west longitude, and it is customary to use "w" as the code.

Latitude is the normal of a point on the ellipsoid, and the angle between the normal of the point and the plane of the equator, the value of which is between 0 and 90 degrees. The latitude of a point north of the equator is called north latitude and is denoted as n; The latitude of a point located south of the equator is called south latitude and is denoted as s. The longitude of the prime meridian is 0°, and the longitude of the rest of the earth is 180° east or 180° west.

Calculation method:

In any place on the earth, as long as there is a watch, a bamboo pole, and a tape measure, you can know the local latitude and longitude. However, the table must be proofread against the country's standard time.

1. Calculate the two equinox days first: for example, somewhere in China, the shortest time of the rod shadow is 13:20 at noon, and the ratio of the rod length to the shadow length is 1, then it can be seen that the place is 45 ° north latitude (tg = 1), and the ratio of the rod length to the shadow length of 100 ° east longitude (1 hour minus 15 ° from 120 °, 4 minutes minus 1 °) needs to be found in the table, and a special angle is used here.

2. The algorithm for calculating the two solstices and longitude remains unchanged The latitude is in the northern hemisphere winter solstice +, and the summer solstice can be corrected by adding or subtracting the correction value on any day.

3. Correction value algorithm: that is, the difference in the number of days from two minutes or two solstices is multiplied by 94 365For example, on February 17, 2013, the difference between the vernal equinox on February 17, 2013 and March 22, 2013 is 33 days, that is, the direct point of the sun is in the southern latitude.

The above content reference: Encyclopedia - latitude and longitude.

The valid range of latitude and longitude is -180 degrees to +180 degrees of longitude, and latitude is about -85 degrees to +85 degrees.

Parallel. The parallel, like the meridian, is an auxiliary line assumed by humans for the convenience of measurement, and is defined as the trajectory formed by the rotation of the earth at a point on the earth's surface. Any one of the wefts is round and parallel to each other.

The length of the parallels is the circumference of the equator multiplied by the cosine of the latitude of the parallel, so the equator is the longest, and the farther away from the equator, the shorter the circumference, and it shrinks to 0 at the poles.

From the equator to the north and south, each 90°, is called the north and south latitudes, which are denoted by "n" and "s", respectively. The longitude is divided into east and west, the guide is north, and the latitude is divided into north and south, referring to east and west.

Meridian. The meridian, also known as the meridian, is an auxiliary line hypothesized by human beings for the convenience of measurement, and is defined as a semicircular arc on the great circle line connecting the north and south poles on the earth's surface. Any two meridians of equal length intersect at the north and south poles.

Each meridian has its corresponding numerical value, called longitude. The meridian indicates the north-south direction.

The origin of the name of the meridian: "In the stereoscopic motion trajectory of a certain day, the celestial body appears at the same time at each point on the same meridian in the upper middle heaven (noon) and the lower middle heaven (sub)." Different warp threads have different places when.

It is earlier in the easterly area and later in the westerly area.

1. Latitude and longitude representation and conversion.

Longitude and latitude are expressed in degrees, which can generally be expressed directly to a decimal point, but the decimal point of a degree can also be divided into arc minutes (1 arc minute equals one-sixtieth of a degree) and arc seconds (one arc second equals one-sixtieth of an arc minute).

1. Degrees, minutes, and seconds (degrees: minutes: seconds) 49°30'00"-123d30m00s

2. Degree minutes (degrees: minutes) 49°'

3. The degree is generally four decimal places).

Many software can convert different longitude and latitude representations.

Second, the order of writing latitude and longitude.

1. Longitude is used first, latitude is used later.

The following is the use of longitude before and latitude after (longitude, latitude), for example: Taipei City is written as 121°38 e, 25°2 n.

2. Latitude is in the front, and longitude is used in the back.

The following is the use of latitude before and longitude after (latitude, longitude), for example: Taipei City is written as 25°2 N, 121°38 E.

The above content reference: Encyclopedia - latitude and longitude.

Longitude pronunciation: jīng dù

Definition: The distance between east and west on the earth's surface, with the prime meridian being 0°, east being east longitude, west being west longitude, and east and west being 180°. The degree of distance between the meridian of a place and the prime meridian is the longitude of that place, see meridian.

Note: Distance:

1.Confrontation. distance, through "refuse".

2.Be apart; Distance from each other.

KWh: Number of kWh: The number of kWh used is increasing month by month.

Extension: Warp compound.

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The dividing line between east and west longitude is the prime meridian (0 degrees of longitude), east longitude, and west longitude west (east longitude increases to the east and west longitude increases west).

East longitude is positive, west longitude is negative. Longitude is the degree in which a point on Earth is east or west of a north-south alignment line called the prime meridian.

The longitude of the prime meridian is 0°, and the longitude of the rest of the earth is 180° east or 180° west. Unlike latitude, which has an equator as a natural starting point, longitude has no natural starting point, and the line that is the prime meridian is chosen by the people.

The longitude range is 0-180°. Longitude is a semicircle connecting the north and south poles, with the longitude of the Greenwich Observatory in the United Kingdom as 0 degrees, and the east and west directions are divided into 180 degrees, and the 180 degrees to the east belong to the east longitude, and it is customary to use "e" as the code name, and the 180 degrees to the west belong to the west longitude, and it is customary to use the "w" as the code name. Specifically, the degree to the east or west of a north-south alignment of a point on Earth called the Prime Scatter Meridian.

The time zones are also divided into regions, with a difference of one hour every 15 degrees of longitude. Longitude, as a basis of geography, is the basic theory for understanding the rotation of the earth and the geographical division of regions.