How is world time calculated, and how is world time converted

Simple stuff for it! Just know that 15 degrees is 1 hour, the world has 24 time zones. When we know the regions that are different in time zones, Anton plus West subtracts them to turn into the time of the region.

Universal time is time in the 0 degree zone. Using the time zone of other regions and the time difference of the 0 degree zone, it is calculated according to the east-west direction in the 0 time zone and the energy subtraction of east plus west!

There are several types of questions that won't be able to ask me drops!

Based on London time, every fifteen degrees is measured by hours, he subtracts from the west, adds from the east, takes the date change line (most of which coincides with the 180-degree meridian) as the base, adds one to the west date, and subtracts one from the east date.

24 hours a day.

A difference of 4 degrees in longitude is a minute difference.

In order to facilitate the communication between different regions, in 1884, the international time zone was divided according to a unified standard, and the method of zonal timing was implemented. According to this division method, every 15° of the earth is used as a time zone, and the world is divided into 24 time zones, and the local time of the meridian of each time zone is the standard time zone time of that time zone. The calculation of zone time is generally divided into the following steps:

1. Calculation of time zone:

If you want a zone of longitude, you first need to calculate the time zone in which the longitude is located. The formula for converting longitude to time zone: longitude 15° = m (quotient), n (remainder) (for n °, time zone m; n °, the number of time zones m+1).

According to this formula, it is also possible to calculate the range of longitude spanned by the m time zone, i.e., 15° m (the number of time zones ° (the number of time zones 15° is the longitude of the ** meridian of this time zone).

2. Calculation of time difference in geographical area:

If you know the district of place A and find the district of place B, you must first calculate the time difference between the two places. If A and B are located on the same side of the central time zone, the time difference between the calculation zone is subtracted, for example, when the difference between East Zone 8 and East Zone 2 is 6 zones, and when the difference between Zone 9 and Zone 2 is 7 zones. If A and B are located on both sides of the middle time zone, the time difference between the zone is calculated by additive, for example, the difference between the West Zone 6 and the East Zone 6 is 12 zones.

3. Calculation of geographical area:

The calculation of zone time follows the principle of "east plus west minus". If you know the time of place A and find the time of place B, then the time of place B The time difference between the time zones of place A and B (the time difference between the time zone where the two places A and B are located (the time difference between the time zone B on the east side of the place A is " and the "" on the west side of the place A is used).

4. Processing of calculation results:

Since the whole day adopts the 24-hour system, if the calculation result is greater than 24 hours, 24 hours should be subtracted, and the date plus one day is the time sought; If the result is negative, add 24 hours and subtract one day from the date to get the time you want. When encountering New Year's Eve and month, pay attention to big months, small months, ordinary years, and leap years.

The world is divided into 24 time zones. They are the middle time zone (zero time zone), East 1-12 zones, and West 1-12 zones. Each time zone spans 15 degrees of longitude and the time is exactly 1 hour.

Finally, the 12th East and West Districts each span longitude degrees, bounded by 180 degrees east and west longitude. The time on the **meridian of each time zone is the time uniformly adopted in this time zone, which is called zone time. There is a 1-hour difference in time between two adjacent time zones.

For example, the time in the East 8 Zone of China is always 1 hour faster than the time in the East 7 Zone of Thailand, and 1 hour slower than the time in the East 9 Zone of Japan. Therefore, people who travel abroad must adjust their watches at all times to match the local time. Whenever you go west, you must move your watch forward by 1 hour for each time zone you pass (e.g. from 2 o'clock to 1 o'clock); Whenever you go east, you have to set your watch back by 1 hour (e.g. 1 o'clock to 2 o'clock) for each time zone you pass.

With the zero degree meridian as the starting point, that is, the prime meridian, the west longitude to the east longitude is the middle time zone. Then the range from east longitude to east longitude is east.

1. East 2nd ......East 11th district, every 15 degrees in one hour. The west longitude is the same.

When calculating the difference between urban areas, you can use the negative sign on the west side to indicate it, and then (longitude a - longitude b) 15

It is the time zone in which they differ, for example, 120 degrees east longitude (east 8 degrees) and 60 west longitude (west 4 area).

Illustrates that the two places differ by 12 time zones.

The formula for calculating time: end time start time elapsed time. First subtract the whole point, then subtract the minutes, if the number of minutes is not enough, take one hour out of the hour to make 60 minutes and add the original subtraction.

If the corresponding minute is less than the former, one hour should be borrowed from the latter's hour, i.e., 60 minutes.

General mathematics is decimal 10, that is, to 10 to one digit, but in time, hours, minutes, and seconds are all in 60 decimal system, that is, 60 to one digit. The end time and start time must be timed at 24 o'clock. The time conversion relationship is as follows:

1 hr(h) 60 min(m) 3600 sec(s).

Physical time calculationsAccording to the relationship between speed, time and distance, it is obtained:

The alphabetical formula for finding the distance is: s=vt.

The alphabetical formula for finding velocity is: v=s t.

The formula for finding the time letter is: t=s v.

In physics, velocity is used to express the speed and direction of an object's motion, and the velocity is numerically equal to the ratio of the displacement of the object's motion to the time taken for this displacement to occur, and the unit of velocity in the SI system of units is meters per second.

New York time difference: -13 Paris time difference: -7 Tokyo time difference: +1

Solution: 14-13=1 (hour) is New York City at 14:00 Beijing time.

It's only one o'clock in the morning.

A: Not suitable.

The difference between mean solar time and true solar time. The time difference is constantly changing throughout the year, with a maximum positive value of +14 minutes and 24 seconds and a maximum negative value of -16 minutes and 24 seconds, which is equal to zero four times.

The difference between the local time of two regions is called the time difference.

Local time: Rotates with the Earth.

The sun rises in the east and sets in the west during the day, and the sun passes through the highest point of the sky in a certain place at 12 o'clock in the local time, so there are different places on different meridians. The same time used in the same time zone is regional time (local time on the ** meridian of the region) and the same time used worldwide is universal time (0 degrees of longitude.

place). The longitude varies by one hour every 15 degrees in regional time and every 4 minutes in local time.

The standard time around is Greenwich Mean Time.

Add (+) or subtract (-) the hour and minute in the time zone. Many countries also use daylight saving time (DST), such as the United States, which runs from April to September each year, which is an hour earlier.

The calculation method of time difference: the subtraction of the standard time (the number of real-time zones) of the two time zones is the time difference, and the time when the value of the time zone is larger is earlier. For example, China is the East 8th District.

8) The eastern part of the United States is the West 5th Region (-5), and the time difference between the two places is 13 hours, and Beijing is 13 hours earlier than New York; If it is a period when daylight saving time is implemented in the United States, the difference is 12 hours.

Time-supported algorithm: sub-time: 23:

00--1:00 ugly hour: 1:

00--3:00 Yin: 3:

00--5:00 Mao hour: 5:

00--7:00 Chen's year roll: 7:

00--9:00 hours: 9:

00--11:00 Afternoon: 11:

00--13:00 No time: 13:

00--15:00 Deuteronomy: 15:

00--17:00 unitary hour: 17:

00--19:00 戌时:19:

00--21:00 Hours:21:

00--23: The heavenly stem of the Doubei 00 hour pillar is calculated according to the heavenly stem of the sun pillar. There is a poem:

A has been born A, B Geng C is the beginning, Bingxin is looking for Wu, Ding Ren Gengzi is dwelling, where is Wu Gui, Renzi is the true way. The meaning of this poem is: Jia day or Ji day, when the heavenly stem of the hour starts from Jia, that is:

Jiazi, Kongque destroys Yichou, Bingyin, Ding Mao, ·· Push it down. On the second day or Geng day, when the heavenly stem of the pillar of time starts from C, that is: Cingzi, Ding Chou, Wu Yin, Ji Mao, ·· On the day of the C or Xin day, when the heavenly stem of the pillar of time rises from E, i.e.:

Wuzi, Jichou, Gengyin, Xinmao, ·· Ding day or Ren day, the heavenly stem of the time pillar starts from Gengzi, namely: Gengzi, Xin Chou, Ren Yin, Gui Mao, ·· Wu day or 癸日, the heavenly stem of the time pillar starts from the non son, that is: 壬子, 癸ug··· This is the same principle as "the year rises and the moon rises", can you make sense of this?

9 o'clock is equal to the day.

Idea: Because there are 24 hours in a day, 1 hour 1 24 days, so 9 hours 9 24 days.

Time Unit Conversion:

Century = 100 years 1 year = 12 months.

Century Crack Nathan: A unit for calculating the age, 100 years is a century.

2. The big month (31 days) has a month.

Big month: refers to the month of 31 days in the Gregorian calendar (Gregorian calendar), and the seven months of 13, 5, 7, 8, 12 and 12 of the Gregorian calendar are the big months, with an average of 31 days.

3. There are months in the small month (30 days).

Small mu month: refers to the month of 30 days in the solar calendar or 29 days in the lunar month.

4. 28 days in February in ordinary years and 29 days in leap years.

Ordinary year: A year without a leap day in the Gregorian or Yin Min Guess calendar, or a year without a leap month in the lunisolar calendar.

There are 365 days in a normal year and 366 days in a leap year.

5. Leap year: a year with a leap day in the solar or lunar calendar, or a year with a leap month in the lunisolar calendar.

Day = 24 hours 1 hour = 60 minutes.

Day: A unit of time based on the Earth's rotation period, equal to 86400s.

8. Minute: The auxiliary unit of time.

1 minute = 60 seconds 1 hour = 3600 seconds.

Second: The basic unit of time.

In 1960, world time was widely used as a basic time measurement system.

It is not a uniform time system due to the influence of changes in the speed of rotation of the Earth. However, because it is related to the angle of the Earth's rotation, world time is still necessary for everyday life, astronomical navigation, geodetic surveying, and spacecraft tracking, even after the function of measuring time was replaced by almanac time in 1960. At the same time, accurate universal time is one of the basic data of the earth's rotation, which can provide necessary basic information for the study of the earth's rotation theory, the earth's internal structure, plate movement, ** forecast, and the origin and evolution of the earth, the earth-moon system, and the solar system.