About Time: A First Look at Time and Clocks

On the ancient Egyptian solar calendar, the year began with the...

• first full moon after the harvest of the wheat.

• alignment of the Sun at sunrise with a shaft in the Great Pyramid.

• rising of Sirius, which coincided with the flooding of the Nile.

• appearance of Orion, which was celebrated as the rebirth of the god Ra.

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CCSS.RI.4.2

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How did Julius Caesar alter the Egyptian calendar?

• He ordered an extra day added to the month of February every year.

• He divided the calendar into twelve months.

• He declared the beginning of the year to be Easter Sunday.

• He numbered the years beginning from the first year of his reign.

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CCSS.RI.3.5

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An improved sundial, the hemicycle, consisted of a ...

• hollow reed with a round stone ball.

• glass lens and a large marble triangle.

• tiny stone pyramid scored with notches.

• stone half bowl with a metal pointer.

What were part of the water clocks in medieval monasteries in Europe?

• Figures of Noah, Moses, Jesus and the saints.

• Candles that were lit by the striking of a flint during the nighttime hours.

• Bells to strike devotional, work and dining hours.

• Sacred symbols that marked the seasons in the church year.

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CCSS.RI.3.5

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The first mechanical clocks were powered by the...

• pull of weights.

• light of the Sun.

• weight of falling grains or rice.

• pull of magnets.

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CCSS.RI.4.5

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Who carried the first well-known watches?

• sailors

• bankers

• guards

• priests

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Giannelo Torriano of Cremona, Italy, invented a machine that could...

• make a clock face glow in the dark.

• wind clock springs.

• make glass sheets without bubbles.

• cut perfect gear teeth.

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CCSS.RI.4.2

CCSS.RI.5.2

CCSS.RI.6.2

CCSS.RL.5.2

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Timekeeping precision was improved when Huygens built a clock with a ...

• radium dial.

• pendulum.

• battery.

• copper pulse counter.

How do quartz clocks and watches make use of quartz crystal?

• They have a hard, polished disk of quartz that covers the dial.

• They have gears cut from slices of quartz crystals.

• They use a small battery to make a quartz crystal pulse regularly.

• They use the electricity found naturally in crystals to power the clock.

What was the Greeks' theory of time?

• It was simply a dream in a person's mind.

• It turned ever in a loop.

• It was a game controlled by the gods.

• It expanded outward from Earth.

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CCSS.RL.4.9

CCSS.RL.8.9