Time calculation in geography, compulsory time calculation in geography in senior 1

Ship from west to east: the result is 12:05 on December 30 or 12:05 on December 31.

Ship from east to west: the result is 12:05 on December 29 or 12:05 on December 30.

Five minutes to cross the meridian, because the speed of the ship is limited, the ship should always be in the 12 time zone, so the time is 12:05; The 180-degree meridian is not equal to the International Date Line, so dates may or may not change.

The first. From the East 12th District to the West 12th District, the date is reduced by one day. It was 12:05 on December 29.

The second. From the West 12th District to the East 12th District, the date is added by one day, which is 12:05 on December 31.

The third practical application.

For countries that cross the 180-degree meridian, the date remains unchanged at 12:05 on December 30.

For example, Fiji and Tonga cross the date line, and the date line moves to about 172 degrees west longitude.

12:05.

12:05.

There is also at 12:05 the International Date Line, which has a bend and is not equal to 180 degrees of longitude.

It could be December 30 at 12 o'clock, or it could be December 29 at 12 o'clock, or it could be December 31, because the international date line is not equal to the 180 degree meridian.

Sun altitude angle at noon = 90 degrees - the difference between the latitude of the ground and the point of direct sunlight.

The time of the sought place = the time of the known place + (or -) time difference (the determination of the plus and minus signs: east plus west minus, that is, the sought land is bolded to the east of the known place, and the minus sign is used to the west of the known place; The time difference can be derived from the longitude difference: 1 hour for every 15 degrees of longitude, 4 minutes for every 1 degree difference in longitude).

The time of the region = the time of the known region + (or -) the difference of the time zone (the determination of the plus and minus signs: if the same is the eastern time zone or the same western time zone, the minus sign is used, and the plus sign is used if it is different; Determination of time zone difference: if the same time zone is the east time zone or the same time zone is the west, the number of two time zones is subtracted, and the number of two time zones is added if it is different).

Day length = 24 - night length.

The longitude spanned by the day's arc is 15 degrees.

The night length is similar to the day length, just swap the "day length" and "night length" in the above formula, and change the "day arc" to "night arc").

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 obtained is greater than 1, if it is less than, the quotient remains unchanged, and the quotient is the time zone where the place is located. Time of the place sought Time of known place 4 minutes Difference in longitude (east plus west minus).

1. Within a certain area, a kind of time is used uniformly, and this kind of time is called regional time. Zone time is also called standard time, each time is used in the time zone ** longitude is located in the place of the longitude for the whole area of the time (the longitude divisible by 15 is the ** meridian of the time zone), this time becomes the zone of this time zone, in the zone time, in addition to the east and west twelve zones, any two adjacent time zones, the zone time difference is one hour, between any two time zones, a difference of several time zones, the zone time difference is a few hours.

2. In terms of time difference, there are several time zones between the two places, and the difference between the zone time is 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.

3. Find the time zone: the number of time zones is known to be longitude 15° (the quotient is rounded to an integer, which is the number of time zones). When finding the zone:

Time of the desired zone Time of known zone Time zone difference (east plus west minus). Time to find place: Time to find place Time to know place Time 4 minutes degree Longitude difference (east plus west minus).

4. In the local time, because the earth is constantly rotating, the direction of the surface of the earth is constantly changing relative to the sun, so the time of each place advances in turn. So, at the same moment, the time is different in different places on the planet.

The altitude angle of the sun at noon = 90 degrees - the latitude difference between the latitude of the ground and the point of direct sunlight of the earth and the time of the place of the sun = the time of the known place + (or -) the time difference (the determination of the plus and minus signs: east plus west minus, that is, the land sought is used with a plus sign to the east of the known land, and the land is used with a minus sign to the west of the known land; The time difference can be derived from the longitude difference: one hour for every 15 degrees of longitude, and 4 minutes for every one degree of longitude).

The time of the region = the time of the known region + (or -) the difference of the time zone (the determination of the plus and minus signs: if the same is the eastern time zone or the same western time zone, the minus sign is used, and the plus sign is used if it is different; Determination of time zone difference: if the same time zone is the east time zone or the same time zone is the west, the number of two time zones is subtracted, and the number of two time zones is added if it is different).

Day length = 24 - night length.

The longitude spanned by the day's arc is 15 degrees.

The method of finding the night length is similar to the day length, just swap the "day length" and "night length" in the above formula, and change the "day arc" to "night arc").

Is it about the calculation of time zones. There is a principle of East plus West Minus. The East Time Zone is positive and the West Time Zone is negative.

Known time + (number of zones in the time zone sought - number of zones in the known zone) = time in the time zone found.

Note: Calculated on a 24-hour basis. Be aware of the change in the date. Use of the International Date Line.

It's very simple, your own current time zone, the other party's time zone, addition and subtraction can be calculated Don't think about it so complicated

East morning and west evening, east plus west minus, the same area plus different areas want to subtract.

Okay lz

The regional time can be calculated by mastering 3 formulas and 1 note.

One is"East plus West minus", that is, if you determine the time of point A, and point B is on its east side (note that it has nothing to do with the north-south direction), then it must be time added, and time must be subtracted on the west side;

Note: It is important to note that an additional day is added or subtracted from the international date line in the east and west, such as Siberia in Russia and Alaska in the United States, although Siberia"Like"It's west of Alaska, but in fact if you know the time at a certain point in Alaska, and extrapolate the time at a certain point in Siberia, you need to go up +1 day after subtracting the time.

The second is"1 hour per time zone, 15 degrees per time zone".For example, if our country is in the East 8th Zone, we are on the east side of the zero time zone, and the zero time zone is 0:00 in the middle of the night, then we are 8 o'clock in the morning.

The third is"Every minute accounts for 4 degrees"For example, if we say that Beijing is roughly 116 and a half degrees east longitude, then the time of Beijing is the same"Beijing Time"Is it early or late? The standard corresponding to the East 8 district"Beijing Time"The positive ** is 15 * 8 = 120 degrees east longitude, Beijing is 3 and a half degrees west of the center of the East 8 district, you need to subtract minutes, this is the time (local time) in Beijing

If jet lag is required, you don't have to consider latitude, just longitude. (1) The time difference between the two places is calculated by using the longitude difference between the two places, the time difference of 1 degree in longitude is 4 minutes (15 degrees is 1 hour), and the time zone is calculated every other time zone, and the time difference is one hour. (2) If you know the time of a certain place and find the time of another place, you should mainly judge whether the place you are seeking is located on the east or west side of the known time, and the calculation rule is to add the time difference to the east and subtract the time difference to the west.

3) In the calculation process, if the 180-degree meridian is crossed, that is, the international date change line, then one day will be subtracted when crossing the date line to the east, and one day will be added when crossing the date line to the west. (4) The local longitude can be used to calculate the time zone where it is located, by dividing the longitude by 15 and rounding it to an integer, and the time area code is obtained. For example, Beijing is 116 degrees east longitude, divided by 15 according to the above method, which is about 8, so Beijing is located in the 8th district of the east.

Addendum: To calculate the time, you have to find a way to find a usable known time, from a higher point of view, the best time to find is to use the direct sun point and the morning and dusk line, the meridian where the direct sun point is located must be 12 o'clock, the meridian where the morning line and the equatorial intersection are located is 6 o'clock, and the meridian where the dusk line and the equatorial intersection point is 12 o'clock).

Arrival time = departure time + transit time.

Arrival time = 8:00 a.m. on August 1 +10+16 (converted to East 8th District) 2Scope from the same date as Beijing:

180 to the west - 0:00 on August 2 because Beijing time is 10 o'clock, and the ** meridian of the West 2nd District is 0:00 on the 2ndMore than half.

The time difference between West 8 and East 8 = 16 hours.

When Xiao Ming got on the plane, San Francisco 1 was 8 o'clock, then Beijing 8 + 16 = 24 o'clock (east plus west minus) that is, 0 o'clock on the 2nd, 10 hours later, Beijing 10 o'clock, so choose C