Vocabulary Time difference hour time zones elapsed duration
Vocabulary: Time difference hour time zones elapsed duration minute hour seconds bridging days international time years months weeks UTC Greenwich Mean time Time
Time Conversions: Time can be written as digital or analogue time, or in 24 hour time: 2: 10 can be written as ‘ 10 past 2’ ‘a quarter to three’ can be written as 2: 45 An hour is divided into 12 sections of 5 minutes each. A day is divided into 24 hours; each of 60 minutes. Each minute is 60 seconds.
Solving Time Problems: To work out time problems, it can be helpful to use a ‘clock face’.
Using Your Calculator Time calculations can be done on your calculator. The times are entered into the calculator in this order: hours, minutes, seconds. Enter the hours and press the ° ' '' key. Next enter the minutes and press ° ' '' again. Then finally enter the seconds and press ° ' '' a third time. If there are no hours to be entered, press 0 followed by the ° ' '' key, as the calculator records the information in the order hours, minutes, seconds. This one
Time Zones Earth rotates 360° in 1 day, so 360° = 24 hours 15° = 1 hour (360 ÷ 24 = 15) 1° = 4 minutes ( 1/15 of 60 min = 4 min) Time zones (called meridians) begin at Greenwich in London (longitude 0°). The first or prime line (meridian) is the starting point for 12 time zones west of Greenwich and 12 time zones east of Greenwich. Every place within a zone uses the same time. Coordinated Universal Time abbreviated to UTC, is the primary time standard by which the world regulates clocks and time. It is within about 1 second of mean solar time at 0° longitude; it does not observe daylight saving time. For most purposes, UTC is considered interchangeable with Greenwich Mean Time (GMT), but GMT is no longer precisely defined by the scientific community.
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