The problem of finding longitude in geography is how to find the longitude difference between the tw

The relationship between local time difference and longitude difference: from west to east, longitude is added by one hour for every 15° local time (one hour earlier); 4 minutes for every 1° span of longitude; Longitude is added by 4 seconds for every 1 place crossed. To the west, the corresponding time is subtracted.

Now, the longitude of Beijing is 116°24 (if the answer is 101°, then the latitude of Beijing is set at 120°, and the following calculations are not wrong!) The landlord calculates it himself).

The time in a certain place is 1 hour and 16 minutes later than Beijing (13:16 12:00), so the longitude of a certain place = 116°24 -15°-1°*(16 4) 97°24′

Solution:1The Sun is located on the earth, and the midheaven indicates that the local time of the earth is 12 o'clock. The time difference between the place and Beijing is 1:16. And the place is located on the west side of Beijing!

2.Conversion of time and longitude: 1 hour corresponds to 15 degrees, and 4 minutes corresponds to 1 minute.

The difference between the longitude between the place and Beijing: 15°4

3.The default longitude of Beijing in this question is 120 degrees east longitude.

4.Find the longitude of the place: 120°E-15°4 =104°56 E

Beijing time should be 12 o'clock, 13:16, less than 1 hour 16 minutes, Beijing longitude 116 ° 24, that is, so for.

The longitude difference between the two places is as follows: if the two places belong to the east or west longitude, the longitude difference is subtracted from the smaller one with the larger longitude value. For example, the difference in longitude between 120 degrees east longitude and 90 degrees east longitude is 120-90 = 30 degrees.

If one of the two places is east longitude and the other is west longitude, when the sum of the longitude values of the two is less than 180, the sum of the longitudes is the longitude difference between the two places. When the sum of longitudes is greater than 180, the difference in longitude is 360 - the sum of longitudes. For example:

The sum of the longitudes of 120 degrees east longitude and 120 degrees west longitude is 240, then the longitude difference between the two is 360-240 = 120 degrees.

I remember that in calculating the difference in longitude on the opposite side there were two cases: 1Longitude difference = two longitudes and (at two longitudes and less than 180°) 2

or longitude difference = (180° - two longitudes and).There is a calculation problem (when two longitudes and more than 180°), roughly saying that a place is in (60°N, 106°W), and the local time is February 28, 2010 at 18:30, when you ask the place B (40°S, 104°E), the sum of the longitude difference between the two places has exceeded 180°, then the longitude difference should be 180°-210° and then calculate the time of place B, but why is the answer longitude difference 210°, so as to calculate the local time.

It is about 111 kilometers.

1 degree 111km on the deficit gauge cover (1 degree of longitude on the equator means 111 km, that is, the circumference of the circumference is changed to the circumference of the circumference = 2*, then at any point, the difference of longitude 1 degree is 111*cosa).

The actual distance represented by 1 longitude on either latitude is equal to 111 * cos latitude, 111 * cos23 = 111 * approximately equal.

Categories: Education, Science, >> Learning Aid.

Problem description: The longitude is divided into ( ) degrees, calculated from the 0 degree meridian, and the ( ) to the east of ( ) to ( ) belongs to ( ) to the west of ( ) belongs to ( ) 180 degrees of meridian is formed by the overlap of ( ) and ( ).

Analysis: 360 East West 180 degrees meridian East longitude Longitude West longitude 180 degrees East longitude 180 degrees west longitude.

Summary. Dear, when writing longitude, you only need to write the value of longitude, you don't need to write longitude and latitude. Longitude is the angle between a point on the Earth's surface and the prime meridian, usually expressed in degrees (°). For example, Beijing is located in the east longitude, so it can be simply written.

Pro, when writing longitude, only the value of longitude needs to be written, and there is no need to write longitude and latitude. Longitude is the angle between a simple comma on the Earth's surface and the prime meridian, usually expressed in degrees (°). For example, if Beijing is located in the east longitude, it can be simply written.

1.Longitude and latitude are both parameters in a geographic coordinate system, with longitude referring to the angle from the prime meridian to the east or west, and latitude to the north or south of the equator. 2.

In order to locate a location more precisely, it is sometimes necessary to give latitude and longitude at the same time, so it is necessary to add the corresponding symbol between longitude and latitude, such as n (north latitude) or s (south latitude), e (east longitude) or w (west longitude). For example, the full geographic coordinates for Beijing are , . 3.

Longitude can also be expressed in minutes ( ) and seconds ( ), representing 116 degrees 24 minutes and 24 seconds east longitude.

The premise is that the earth is a standard sphere, as shown in the figure, the radius of the earth (that is, the radius of the equator) is r, the latitude of a certain circle of latitude is , and the radius of this circle of latitude is r, then r=rcos, then the circumference of the latitude coil of latitude is 2 r 2 rcos 40000cos (unit: km, because the circumference of the equator is 2 r 40000 km), then 40000 km 360 degrees km degrees, that is, the length of each longitude difference of the equator is about 111 km, then the latitude is The length of each longitude difference of the parallels is 40,000 cos, 360 degrees, and 111 cos kilometers.

On the same parallel, for each degree of difference in longitude, the actual distance is 111*cos latitude, and this 111 kilometers is based on the equator.

But you know that the higher the latitude, the smaller the circle of latitude, so how to calculate the circumference of different circles of latitude? It is the number of cos latitude * equatorial circumference, and the corresponding distance between different longitudes at the same latitude, that is, 111 * cos latitude.

The distance at the equator is expressed as 111*cos0°=111 cos0°=1

This is actually a mathematical sphere calculation problem. It can be explained mathematically, but it is difficult to understand and requires spatial abstract thinking.

My explanation above, while not fundamental, will certainly help you understand the problem. Because in fact, there is no need to explain it with mathematical spatial abstract thinking.

I hope the explanation will help you, and if you don't understand, then explain it mathematically.

1.If you have eaten oranges, think of the earth as peeled oranges, and imagine that the gaps on each petal are meridians, and the distance between the two gaps is not equal from the "equator" to the "poles".

2.The distance between the warp threads is actually the length of the parallels. The parallels at the equator are the longest, and the further you go to the poles, the shorter they get.

3.Example 1: Find the equator, the longitude difference is 1 degree, the actual distance is: 111*cos0°, note: cos0°=1, so the longitude difference on the equator is one degree, and the distance is 111

4.Example 2: Find the north latitude 60°, the longitude difference is 1°, the actual distance is: 111*cos60°, note: cos60°=1 2, so the distance on 60° = 111 2.

5.Example 3: The distance between the meridians at the North Pole is 111*cos90=0

6.This means that the distance to the poles is shorter.

Latitude is the angle between a point and the geocentric line and the plane of the equator.

111*5*cos30 degrees. " is an estimate that approximates an arc into a straight line.

It's better to look at the globe, you can understand it as soon as you look at it.

111 km.

All meridians intersect at the poles in the north-south direction and are of equal length. The latitude at the equator with a longitude difference of 1° is about 111 km long. When different warp threads have different places.

It is earlier in the easterly area and later in the western. There is a one-hour difference for every 15 degrees of longitude.

Voyagers calculated longitude in angles, minutes, and seconds, from 0 to 180 degrees, with the west being positive and the east being negative. Astronomers use the same direction symbols to calculate longitude in hours, minutes, and seconds. For example, the longitude of the Paris Observatory is -2°20'14'' or -9''20''93, because the meridian circle of Paris is east of the prime meridian circle.