East plus west minus why east early west late east plus west minus west, since east

In local time and district time, the time value is earlier (in the east) and the time value is lower later (in the west), so it is east plus west minus [east early and west late]. This is not the same time as in the same place.

The time in the same place is small early, big late - there is no east or west in the same place.

Calculation of time zone and zone time Find the time zone: (The longitude of a place + the obtained integer quotient is the time zone where the place is located or the longitude of a place 15° If the quotient is greater than 1, the quotient is 1, if it is less than, the quotient remains unchanged, and the quotient is the time zone where the place is located Find the time zone difference: If both places are in the same time zone, that is, the same east time zone or west time zone, then the time zone serial number is subtracted, and the resulting difference is the time zone difference; If two places are not in the same time zone, i.e., one is the east time zone and the other is the west time zone, the time zone serial numbers are added together, and the resulting sum is the time zone difference.

In short: subtract the time zone on the same side and add time on the opposite side. When finding the zone:

In terms of time difference, the two places are several time zones apart, and the zone time difference is only a few hours. If the location of the known zone is in the east and the desired location is in the west, the time zone difference between the two places is subtracted from the time zone between the two places. If the location of the known zone is in the west and the desired location is in the east, then the time zone is added to the time zone difference between the two places, that is, east plus west minus. So in terms of timing, the time zone in the east is earlier than the time zone in the west, in short:

It's morning and evening.

East plus west subtraction is the mantra used in the calculation of local time. The principle is that since the earth turns from west to east, the eastern location always reaches noon first, so the local time is earlier than the western one, so when calculating the local time, the desired location is located to the east of the known place, and the place of the known place is added with bothTime difference

Time of a certain place = 4 minutes of soil when the place is known, and the longitude difference between the two places. The further east you go, the earlier the time, the east is earlier than the local time, and the west is later than the local time: if the desired place is east of the known place, then add the touch, and if it is to the west of the known place, then subtract the same and subtract the difference

If the same is east longitude (west longitude), it will be added, and if one east longitude and one west longitude will be subtracted.

For example, if the area where the high rent is located at 120 degrees east longitude is 12 o'clock, then Beijing is about 117 degrees east longitude, which is three degrees away from 120 degrees, one degree is equal to four minutes, and three degrees is twelve minutes. Since the earth moves from west to east, the sun moves from east to west, so it takes three degrees to add time, so Beijing time is 12:12 o'clock in the standard Beijing local time.

Another example is Xinjiang, that is, about 90 degrees east longitude, 30 degrees away from 120 degrees, 30 degrees is equal to 120 minutes, that is, two hours, so 12 o'clock at noon at 120 degrees east longitude is 10 o'clock in the morning there. If you go to Heilongjiang in the northeast, that is, 130 degrees east longitude, there are ten degrees more, that is, forty minutes are added, so it is equal to 12.40 points there. This is the "East plus West Minus", which is the calculation of "true solar time."

method.

The adjacent time zone to the east is always an hour ahead of the time zone in which it is located, for example, Beijing is in the East 8th District.

It's 17 o'clock in the afternoon, Tokyo is in the East 9th Ward, and it's 18 o'clock an hour earlier. So it's the time zone plus on the east side.

1. Calculate the longitude difference between the two places:

1) If the known and sought places are in the same east longitude or the same in the west longitude, then: longitude funny stupid difference = degrees of greater longitude and degrees of less longitude.

2) If one of the known and the sought land is in east longitude and the other is in west longitude, then: longitude difference = two places of longitude are added.

2. Convert the longitude difference into the local time difference between the mountains and the two places, that is: local time difference = longitude difference of 15° hours; or longitude difference x 4 minutes per degree (1 small celery hour = 15 degrees, 1 degree = 4 minutes).

Known longitude finds the time zone in which the place is located

Divide the longitude of the place by 15 degrees, and make the remainder.

When the remainder is greater than degrees, the quotient plus 1 is the number of time zones where the place is located.

If it is known that a place is located at 145 degrees E, use 145 15, the quotient is 9, the remainder is 10 >, and the quotient plus 1 is the time zone of the place, so the place is located in the east 10 zone. If a place is located at 67 degrees W, use 65 15, the quotient is 4, and the remainder is 5<, and the quotient is the number of time zones in which the place is located, then the place is located in the West 4 zone.

1. East plus West minus.

East plus West minus is used for local time calculations.

Local time calculation is a long-term hot spot in the geography of the college entrance examination, and many teaching and auxiliary materials adopt the method of "east plus west subtraction". However, the east-west direction is theoretically "both east and west", because the latitude is a whole circle, and there is no beginning or end point on the circle; In fact, "either east or west" - the inferior arc orientation method is used.

Since the direction of rotation of the earth is from west to east, the east location always sees the sunrise before the west location, and the time in the east is earlier than the time in the west region, that is, the law of "east plus west minus".

2. West plus East minus.

In particular, it is necessary to pass through the International Date Line (180 degrees of longitude).

In this case, the principle of east minus west plus should be followed, that is, when you want to cross the date line to the east, the date is minus one day, and when you cross the date line to the west, the date is added by one day.

1. East plus West Minus: It means that when calculating local time and district time, the principle of east plus west subtraction should be followed, that is, for every 1 longitude to the east, 4 minutes will be added to the local time, and 1 hour will be added to the zone time for every time the time passed east. To the west, it is reduced.

2. East minus West plus: It means that when passing through the International Date Line (180 degrees meridian), the principle of East Minus West Plus should be followed, that is, to the east across the date line, the date is minus one day, and to the west across the date line, the date is added by one day.

is the formula for calculating time. The date of crossing the date line from east to west is added by one day, and the date of crossing the date line from west to east is subtracted by one day. That's why it's called East Plus West Minus.

It is a mantra used in the calculation of local time.

The principle is: since the earth turns from west to east, the eastern location always reaches noon first, so the local time is earlier than the western one, so when calculating the local time, the desired place is located to the east of the known location, and the time difference between the two is added to the known local time; If the requested location is to the west of a known location, subtract the time difference between the two by using the known location;

The calculation formula: the time of the place = the time of the known place and the time difference (longitude 4) plus west minus.

According to the longitude difference of 15°, the time difference is 1 hour, the country in the east is added, and the country in the west is subtracted.