High 1 geography day limit Example 1 case 2 case 3 case 4 To calculate the process to the reason tha

It's a very simple question, but I don't remember it very clearly.

Example 1, 1 hour occupies 15 degrees of longitude, then it can be seen that 1 fine longitude is 4 minutes, 125 degrees east longitude and 115 degrees east longitude, a difference of 10 degrees, (knowing that east longitude 125 is located on the east side of east longitude 115) then it is 9:30 + 4 minutes longitude * 10 longitude = 10:10.

Complete! The same reasoning as West Longitude 85 is OK.

Example. 2. London is the place where the prime meridian passes, which tells you that the latitude and longitude of 0 degrees are 12:00 and 20:

00 is 8 hours ahead of London, which is in the eight time zones on the east side of London, and then it's your memory, which of the four answers is in the eighth time zone of London? It can also be used to prompt your latitude and longitude to be calculated as 120 15 = 8, answer b. Example.

3. Example 4 is the same principle, it is the estimation of time zones...

Example 1: (125°E-115°E) 4 minutes °=40 minutes, 9:30+40 minutes=10:10

115°E+85°W) 4 minutes °=800 minutes = 13 hours and 20 minutes, 9:30-13 hours and 20 minutes at 85°W=20:10 the day before

Example 2: London noon means that London time is 12:00, and local time is 20:00 in Shanghai.

The location at 20:00 local time is located east of London, 8 hours ahead of London time, and is located around 120°E.

Example 3: May 1, 1 a.m. Beijing time; The longitude range for the new day is 75°E to 180° east.

Beijing is 13 hours ahead of New York time, and New York time plus 13 hours is Beijing time.

The new day heads east from 0:00 local time to 180°

Example 4: Select C

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.

Cut the Earth's International Date Line (about 180° longitude) and combine it to create a map of the world that you usually see.

Know the time of one place and see if another place is in its west or east on the world map. If it is in the east, add the number of time zones in which it is located, which is the time of another place; In the case of West, the number of time zones intervened.

78°W in West Zone 5 (, 116°E in East Zone 8 (.

5 + 8 = 13, so 13 hours should be added, which is 9:30 on January 1, 2008.

The algorithm does not pass through the date line, eliminating the calculation of adding or subtracting one day, if the two points are at the easternmost and western ends of the map, only 24 hours need to be added or subtracted, which is equal to adding or subtracting one day.

Because the sun moves from west to east, the time in the east is always earlier than in the west.

The 78th degree west longitude is located in the West 5th District. The 116th degree east longitude is located in the 8th East District. The difference between the two places is 13 hours. At 116 degrees east longitude, it is 13 hours ahead of 78 degrees west longitude.

When the time zone of the 78°W meridian is 20:30 on December 31, 2007, the time zone of the 116°E meridian is 9:30 on January 1, 2008.

78 + 116 = 194° 180° is 12 hours 14° hour 56 minutes East plus West minus 116°E is east longitude So add 12 hours and 56 minutes on January 1 at 8:56 a.m.

The 116 degrees meridian is in the meridian area where Beijing, the capital of our motherland, is located, and the 78 degrees meridian is in the West Fifth District, which can be calculated, so to calculate the time of the 116 degrees meridian, add the time of the West Fifth District (West Fifth District + East Eighth District) to get the number on January 1. . .

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").

Formulas related to the calculation of common local time and district time:

1. Sunrise = 12 - Day length * 1 2 Sunset = 12 + Day length * 1 2

2. Time zone serial number = (longitude + 15 round the whole number 3, time zone ** meridian = time zone serial number * 15.)

Others: 1. Noon sun altitude = 90°- local latitude The latitude of the direct point ("+" is used in different hemispheres and "-" is used in the same hemisphere

2. Latitude of the polar day or polar night + latitude of the direct sun point = 90°3, noon solar height of the area where the polar day or night happens to occur = 2 * latitude of the direct point.

1.Time calculation: the time sought known time zone time difference time on the way 2Time zone Longitude 15° (if not divisible, compared with the > quotient plus 1, "rounded" zone time difference time zone difference.

3.Date line: The date of crossing the date line from west to east (not exactly passing the 180° meridian) is subtracted by one day, and the date of crossing from east to west is added by one day.

4.Calculation of the height of the sun at noon = 90° — the latitude interval between the point of direct radiation and the point sought)5Day length = sunset time - sunrise time; Day length = 24 hours - night length and sunrise time 12:

00 day length 2 (or 0:00 night length 2); The sunrise time of the point on the equator is 6:00

Sunset time 12:00 day length 2 (or 24:00 night length 2); The sunset time for the point on the equator is 18:00

Sun altitude angle = 90 degrees -|Latitude of the point of direct fire - (+ local latitude|

East plus West minus. 70°E is at 20°W to the east, and it should be larger in the east and smaller in the west.

Calculate the longitude difference first: 90° (longitude difference: if it is both east or west longitude, then subtract; If one is east longitude and the other is west longitude, add it up); Calculate the time difference:

Every 15° difference of one hour, then 90° difference is 6 hours, the local time is larger the further east it is, and 20°W is in the west, and the time difference is subtracted, so it is 6-6=0

20°W is 0:00

Formula: Time of the place sought = Time of known place (difference in longitude 4) Note: East plus West minus.

Steps: Calculate the longitude difference first: all east or west longitude, subtract it.

One east and one west, add up.

Calculate the time difference: 1° = 4 minutes, 15° = 1 hour.

Finally, east plus west minus (the greater the east longitude, the more east; The greater the west longitude, the more west).

Let's start with the steps to find the time difference.

The steps of calculating the time difference are: 1 first find the longitude difference 2 find the time difference (the calculation time difference is 1 hour = 15 degrees, 1 degree = 4 minutes) 3 time = known local time + - time difference (when the required place is in the east of the known place + time difference; When in the west - time difference).

The first step when asking for this question is to find the difference in longitude. 70 degrees + 20 degrees = 90 degrees (when both places are in Xijing or Tokyo, find the difference in longitude between the two places; If you have two places in Tokyo and one in Saikyo, ask for the longitude of the two places

The second step is to find the time difference. 90 degrees 15 degrees = 6 hours.

The third step is to find the time. 6-6=0 (Saikyo 20 degrees is located west of Tokyo 70 degrees, so it has to ).

So the time of 20 degrees in Xijing is 0 o'clock.

70+20=90 at a distance of 90°

90 15=6 is 6 hours apart, because 20°W is in the west, to be subtracted, so 6-6=0 points.

20°W is 0:00

One: The picture should be known. 180w- 0.degree 1 hour. This shows that the two places are 90 degrees apart. Difference of six hours. Two: The time in the east is late (large). So 20w time is 0.

The date is determined by the tangent of the morning and dusk lines and the latitude line, and generally has a special position - tangent to the Polar Circle, if it is a polar day in the Arctic Circle, it is the summer solstice, and vice versa. The point where the morning line and the equator intersect is at 6 o'clock at the meridian, and the point where the early line and the equator intersect at 18 o'clock at the meridian. Find the meridian where noon (12 o'clock local time) is located to find the daytime time, correspondingly find the latitude where the point is found (the same day time is the same day at the same latitude), 12-day time 2 is the sunrise time.

Looking at the intersection of the morning and dusk lines and the equator, the sunrise at 6 a.m. and the sunset at 6 p.m. on the equator regardless of the season.

The middle of the night hemisphere is 24 o'clock, and the day hemisphere is 12 o'clock.

The longitude spans 15 degrees for 1 hour. Because 15x24=360

For the date, look at the 180-degree meridian, add one day to the left, and subtract one day to the right.

The earth turns from west to east, so the time should be early in the east and late in the west. Reflecting on the numbers, it should be east plus west minus, that is, in the case of the same day, the value of the east moment is greater than that of the west. You think, I'm earlier than you.

The time of east longitude is always earlier than the time of west longitude.

You'd better push back from 120° east longitude to the west, 120° east longitude is the east 8th zone, push back to the west, to the 0 time zone, and then cross the 0 time zone, and then go west, 105° west longitude is in the 7th west zone, so that 8 hours in the east 8th zone plus 7 hours in the 7th west zone is 15 hours, that is to say, 120° east longitude is 15 hours earlier than 105° west longitude, so subtract 15 hours from 8 o'clock on September 19, which is equal to 17 o'clock on September 18.

East plus West minus.

The time zone is longitude divided by 15°

East 120° divided by 15° is the East 8th District

West 105° divided by 15° is the West 7th District

The difference is 15 hours

It was September 18 at 5 p.m.

September 18 at 5 p.m.

There is a difference of 9 hours between these two degrees of longitude.

W105° is on the east side of E120° so add 9 hours, but after 180° meridian so subtract one day.

Subtract 15 hours from Beijing time.

I'm really in a coma, you should learn the division of time zones! Take a good look at the algorithm for jet lag!

What do you want to give you a formula about time zones and zones.

East plus West minus should know.

What is known and sought is in the eastern time zone, and the area code is larger in the east, east plus west minus.

It is known and sought that the area code is in the western time zone, and the area code is small in the east, east plus west.

Known and sought: one east and one west, know the east and seek the west, minus the west, know the west, and add the east The 7th district is one hour behind the 8th district in the east.

Here are a few examples.

If you find 10 a.m. Beijing time, add 11 a.m. to 11 a.m.

Find the East 2nd District minus 6 hours and 4 points.

Washington time in the West 5th District minus 13 hours yesterday at 21 o'clock.

When the time zone of longitude is known.

It is known that the longitude divided by 15 and the remainder 7.5 are divided by dividing the integer to be the number of time zones, and the integer obtained by dividing by 7.5 is the number of time zones.

You can calculate the time zone based on the number of time zones.

Another way is to know that the longitude is 8 o'clock at 35° east longitude and 25° west.

The difference between 35°E and 25°W is 60 degrees of longitude 60 divided by 15 equals 4 25°W is on the west side of 35° East longitude So minus 4 hours 4 o'clock.

When finding the place of 62° east longitude, the two meridians are 27 degrees apart, 27 divided by 15, equal 1 remainder, 8 remainder, 4 minutes, 1 hour 32 minutes, plus 1 hour, 32 minutes, 9:32 minutes.

The longitude of one place is known to find the time of another.

The longitude of both places is in east longitude, then the longitude is subtracted, and the number obtained is divided by 15, the whole number is the hour, and the remainder is the minute, and the desired is added to the east side where it is known, and the west side is subtracted, and it is the same as the west longitude.

An east longitude and a west longitude are added to the number of degrees divided by 15, the integer is the hour, the remainder is the minute, and the desired is added to the known east, and the west is subtracted.

Remember East plus West Minus.

I summarized it myself, I don't understand it.