04.1.2 Keeping Time

The time it takes for the Sun to return to the same place in our sky after the Earth has rotated once is called:

• a solar day

• a sidereal day

• the ante meridian time

• an equinox period

Why is there a 4-minute difference between the solar day and the sidereal day?

• because the Earth's rotation is variable, due to the pull of the Moon

• because the stars slowly change their orientations in the Galaxy

• because the Earth is going around the Sun in the course of a year

• because the Earth's axis is tilted by about 23 degrees

How did the world's countries solve the problem that mean solar time varies continuously as a traveler's longitude changes?

• they outlawed traveling long distances

• they offered a reward and thus helped spur the invention of clocks and watches that can change the time they keep as you change longitude

• an international convention adopted a single time zone for the entire world, so we can all be on the same time

• the world was divided into 24 time zones, with all communities within a time zone keeping the same mean standard time

During the period we have daylight savings time, we

• keep our clocks the same, but adopt shorter hours

• add one hour to local standard time

• add an additional time zone to the ones in the United States

• subtract four minutes from the length of the day

Which of the following statements about the International Date Line is correct?

• It runs through Greenwich, England

• When crossing from west to east, you must decrease the date by one day

• It is the only place on Earth where the standard time always equals mean solar time

• The time there is measured with respect to the Moon and not the Sun

Why was the problem of devising a workable yearly calendar so difficult on Earth?

• the Earth's rotation period does not divide evenly into the Earth's period of revolution

• The day is based on what the Sun does, but the year is based on what the Moon does

• The length of the Earth’s year varies from year to year

• The calendar only works at Greenwich, England, and it gets further and further off as you move eastward in longitude

The seven days of the week are named after:

• the seven phases of the Moon

• the seven main constellations through which the Moon is seen to pass in the sky

• the seven "wandering" objects in the Sky that were visible to the ancients

• seven members of Julius Ceasar's family

When England and the American colonies finally adopted the Gregorian calendar in 1752, what dramatic change had to be made?

• all the names of the months had to be changed

• the time zones had to start in England

• 12 days had to be dropped to bring the date and the seasons back into accord

• the number of hours in the day had to be changed

The time required for the Earth to orbit the sun once is called a

• day.

• month.

• week

• year

Tags

NGSS.MS-ESS1-1

A ____ is ROUGHLY the amount of time required for the moon to orbit the Earth once.

• day.

• month.

• week

• year

Tags

NGSS.MS-ESS1-1