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Time Zones Basics
How time zones work, with the U.S. zones and a few world cities.
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- Why do we have time zones?QuestionThe Earth turns, so the sun is high at different times in different places
- How many degrees of longitude is one time zone, roughly?Question15 degrees
- How many hours does the Earth take to turn once?Question24 hours
- What line is zero degrees longitude?QuestionThe Prime Meridian
- Which city does the Prime Meridian run through?QuestionGreenwich, London (England)
- What does UTC stand for?QuestionCoordinated Universal TimeThe standard time all zones are measured from
- What is GMT?QuestionGreenwich Mean Time, the time at the Prime Meridian
- Which line is roughly where one calendar day changes to the next?QuestionThe International Date Line
- Where is the International Date Line in the Earth?QuestionAbout 180 degrees longitude, in the Pacific Ocean
- If you cross the Date Line going west, what happens to the date?QuestionIt moves forward one day
- If you cross the Date Line going east, what happens to the date?QuestionIt moves back one day
- Which way does the sun seem to move across the sky?QuestionEast to west
- If it is noon in New York, is it earlier or later in Los Angeles?QuestionEarlier, because Los Angeles is further west (9 a.m.)
- Name the four main U.S. time zones in the lower 48 states.QuestionEastern, Central, Mountain and Pacific
- Which U.S. time zone is farthest east in the lower 48?QuestionEastern Time
- Which U.S. time zone is farthest west in the lower 48?QuestionPacific Time
- Which zone is New York City in?QuestionEastern Time
- Which zone is Chicago in?QuestionCentral Time
- Which zone is Denver in?QuestionMountain Time
- Which zone is Los Angeles in?QuestionPacific Time
- Which zone is Alaska mostly in?QuestionAlaska Time
- Which zone is Hawaii in?QuestionHawaii–Aleutian Time
- How many hours apart are Eastern and Pacific Time?QuestionThree hours
- What is Daylight Saving Time?QuestionMoving clocks ahead an hour in spring and back in fall to use more daylight
- Which U.S. state mostly does not use daylight saving time?QuestionArizona (except the Navajo Nation)Hawaii also does not use it
- What does a.m. mean?QuestionAnte meridiem: before noon
- What does p.m. mean?QuestionPost meridiem: after noon
- What time zone is London in during winter?QuestionGMT (UTC+0)
- Which time zone is Tokyo, Japan in?QuestionJapan Standard Time (UTC+9)
- Which time zone is India in?QuestionIndia Standard Time (UTC+5:30)
- Which time zone is Beijing, China in?QuestionChina Standard Time (UTC+8)China uses one time zone for the whole country
- Which country has the most time zones, counting overseas territories?QuestionFrance
- Which large country spans eleven time zones?QuestionRussia
- Which zone is Paris in during winter?QuestionCentral European Time (UTC+1)
- Which zone is Sydney, Australia on the east coast in?QuestionAustralian Eastern Standard Time (UTC+10)
- What does it mean when a place is 'ahead' of us in time zones?QuestionIt is further east, and its clock shows a later time
- At which time is the sun directly overhead, on average?QuestionAround noon (solar noon)
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