How many degrees is the longitude difference? The time difference is 1 hour.

Longitude difference 15 degree, time difference 1 hour.

The world is divided into 24 time zones with a longitude of 360 degrees. The time difference between two adjacent time zones is 1 hour, and the longitude span per hour is 360 ÷ 24 = 15 degrees.

The origin of longitude

Internationally, it is stipulated that the meridian passing through Greenwich Observatory in the suburb of London, England, is the starting point of longitude calculation, that is, the longitude is zero minutes and zero seconds, also known as the "prime meridian". Its east is east longitude, *** 180 degrees; It is west longitude, *** 180 degrees. The earth is round, so east longitude 180 degrees and west longitude 180 degrees are the same meridian. Countries have designated longitude 180 degrees as "international international date line".

Extended data:

With the rotation of the earth, the sun rises in the east and sets in the west in a day. When the sun passes the highest point in the sky, the local time is 12. Therefore, different meridians have different local time. The same time used in the same time zone is the time zone (local time on the central meridian of this area), and the same time used around the world is universal time (local time on the meridian of 0 degrees). Local longitude distance 15 degree for one hour, local longitude distance 1 degree for four minutes.

The standard time everywhere is Greenwich Mean Time plus (+) or minus (-) the time difference between hours and minutes in the time zone. Many countries also adopt daylight saving time (DST). For example, the United States implements DST from April to September every year, one hour in advance.

Calculation method of time difference: the difference between the standard time (real-time area code) of two time zones is time difference, and the time zone with larger value is earlier. For example, China is the eighth eastern district (+8) and the eastern part of the United States is the fifth western district (-5). Time difference between the two places 13 hours, Beijing is earlier than new york 13 hours. If it is the period of daylight saving time in the United States, the difference is 12 hours.

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