Question 2: How to calculate the time difference? The formula is local time = known local time and soil 4 minutes × longitude difference between the two places.
It must be clear here:
(1). Selection of addition and subtraction signs in the formula: If the required location is in the east of the known location, use a plus sign; If it is in the west of the known land, use the negative sign, that is, "East plus West minus".
(2) calculation of longitude difference: if the two places are on the same side of the 0-degree meridian, the longitude degrees of the two places will be subtracted (the large number will be reduced); If the two places are on both sides of the 0-degree meridian, the longitudes of the two places are added, that is, "the same reduction but different addition".
(3) steps of calculating local time: ① determining the longitude difference between the two places; ② Determine the local time difference between the two places; ③ Determine the east-west direction of the two places; (4) Enter the formula calculation.
(4) Knowing the local time of the two places and the longitude of one of them, the method steps of finding the longitude of the other place are as follows: ① finding the local time difference between the two places; ② Calculate the longitude difference between the two places; ③ Find longitude (east plus west minus).
Question 3: How to calculate the geographical time difference? Write down the formula for calculating the time difference and longitude, and answer as follows:
Calculation of the distance between latitudes: This is a good calculation, and you don't need any formula. Your thinking is too complicated. Because the parallels are parallel lines, the distance between them is equal, with a difference of about11km per degree. For example, from the equator to the north latitude 10 degree, the distance is about 1 165438 km.
The calculation of time difference really needs to be carefully studied. In fact, it is not difficult to calculate only the time (hours), but it is difficult to cross the daily line. It will be easier to understand in two steps.
Calculate the time difference first: remember: add to the east and subtract from the west (regardless of its date line). I call it "East plus West minus" for short. For example: Beijing time is 10, so every time zone to the east will add one hour, and keep adding. You got it? Add it to the east 12 area and it will be 14, right? Then you go east to the west 12 area, or 14, because these two are the same time zone. Then go east to the west 11th district, which is 15. West 10th District 16 o'clock. It's 24 o'clock when you add it to the west second district, so there is a date problem. After 24 hours, it will be "the next day". It's easy to understand. Just add one day to the date.
The second step is to calculate the date: there are two ways to change the date. One is that we have to add one day after 24 hours; The other is to cross the daily line. Remember (crossing the Japanese line): West plus East minus. This sentence is just the opposite of calculating the time difference (hours). For example, the number 6 is on the west side of the line and the number 5 is on the east side of the line.
Summary: the calculation time (hours) is "East plus West minus"; The calculation date is just the opposite. Do you remember?
I wish you progress in your study.
Question 4: How to calculate the time difference in mathematics? For example: 15 hour is slow, what time is it in China at 8 am and in China at 20 pm? If the other party is slow, use your current negative 15 hour.
8: 00- 15 = 17: 00 the day before.
20:00- 15=5:00
Question 5: How to calculate the time difference between China and the United States? The time difference between the United States and China is 13 hours in winter and 12 hours in summer. What day is today? It depends on the time. Let's take an example: July 23, American daylight saving time,
The time in the eastern United States (such as new york) is 2 1: 00 on July 23rd and 9: 00 on July 24th in China.
The time in the western United States (such as San Francisco) is July 23rd 18: 00, and that in China is July 24th at 9: 00.
New york time is 9: 00 on July 23rd, and China is 2 1 point on July 23rd.
At 6 o'clock on July 23rd, China was at 2 1 point on July 23rd.
Question 6: How to quickly calculate the time difference between China and the United States? Beijing time-15 hour = western time.
Or western time+15 hours = Beijing time.
However, this is too much trouble. I use a simple method, my time +3 hours = Beijing time (but day and night are reversed, and China is half a day earlier than the United States). For example, my calling time is 19 at 8 pm. According to this formula, China is11am (20th, the next day).
If I call at 7: 00 a.m. on the 20th, it will be China 10 in the evening.
China's friends take their time-three hours, which is my time (remember to reverse the morning and afternoon, the United States is half a day behind China).
If it's the morning of 20th 10, and you are reading my blog, it's 7: 00 p.m. (19), so it's time for dinner. Maybe I'm online.
If you read my blog at 8 pm on the 20th, I slept soundly at 5 am.
It is much easier to calculate the time difference between eastern time and Beijing time, which is just 12 hours late. Just reverse black and white, and the time is the same.
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