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35 votes
35 votes
If it is a clear spring day, which of

the following can we say with
certainty after Earth makes one
fourth of a full revolution?
A. It will be summer.
B. It will be cloudy.
C. It will be autumn.
D. It will be night.

If it is a clear spring day, which of the following can we say with certainty after-example-1
User DopplerShift
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3.1k points

1 Answer

22 votes
22 votes

Answer:

A. It will be summer

Step-by-step explanation:

You want to know what can be said with certainty about the season, light, or weather if the Earth makes 1/4 revolution following a clear spring day.

Revolution

The Earth has two motions that we use to mark time. It makes one full rotation about its axis in one day, and it makes one full revolution about the sun in one year.

After 1/4 revolution, 1/4 year will have passed. Each season is given 1/4 year on our calendar, and the one following spring is summer.

One-quarter revolution after a spring day, you will enjoy a summer day. We can say with certainty, ....

It will be summer.

__

Additional comment

There are different definitions of day and year, depending on whether you are interested in clock/calendar time, the time to return to the same relative position among the stars, or the time to return to the same position relative to the sun.

Because of the eccentricity of the Earth's orbit and the way seasons are defined, the seasons are not all the same length (1/4 year). The attachment shows this for 2023 in the northern hemisphere (Amsterdam, NL).

One-quarter of a full rotation would be 6 hours. In springtime in the Northern hemisphere, days are getting longer. There will usually be at least 12 hours of daylight. So, a 1/4 rotation will not guarantee a transition to night has been made.

If it is a clear spring day, which of the following can we say with certainty after-example-1
User Nickkk
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3.3k points