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• What time is it?

• That's a very good question!

• From morning until night,

• clocks help us to plan our day.

• They tell us when things begin and when they end.

• Before clocks, people told time by watching the sun move across the sky.

• They started work when the sun came up in the east.

• At noon, when the sun was very high,

• they ate and rested.

• When the sun disappeared in the west, they went to bed.

• Today, we know that the sun doesn't move around the Earth.

• The Earth turns, or spins, on an imaginary line called an axis.

• As the Earth turns, the sun seems to be moving across the sky.

• The time it takes for the Earth to make one complete turn

• is called a day.

• A day is divided into hours, minutes, and seconds.

• There are 24 hours in a day.

• There are 60 minutes in an hour.

• How many minutes are there in a day?

• Multiply 24 hours times 60 minutes to get the answer.

• 24 X 60=1,440.

• There are 1,440 minutes in one day!

• We measure time by other movements, too.

• The Earth travels around, or orbits, the sun.

• The time it takes for the Earth to go around the sun once is called a year.

• One year is equal to 12 months,

• or just over 52 weeks.

• To be very accurate,

• it takes the Earth 365 days, 5 hours,

• 49 minutes, and 12 seconds to go around the sun.

• We divide the Earth into 24 time zones.

• Each time zone is one hour apart from the next time zone.

• For example, when it is10:00 a.m. where you live,

• it is 10:00 p.m. on the opposite side of the world.

• In two hours, it will be noon where you live,

• but on the other side of the world, it will be 12:00 at night!

• Thanks to clocks and calendars,

• we can measure time very easily.

• However, it is the movement of the Earth

• that really allows us to measure time.

What time is it?

# Oxford Discover 3 Unit 7（Oxford Discover 3 Unit 7 Read along Time and the Earth）

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Cindy Lin 發佈於 2023 年 11 月 17 日