A Solar Day Is the Time It Takes Earth to Rotate

question 109

Multiple Choice

A solar day is the time it takes Earth to rotate on its axis between two consecutive solar positions (for example, high noon to high noon or sunset to sunset) . A sidereal day is the time it takes Earth to rotate on its axis between two consecutive positions of a distant star (Vega on the eastern horizon to Vega again on the eastern horizon) . Which is longer?

• A) A solar day is always longer.
• B) A sidereal day is always longer.
• C) A solar day and a sidereal day are always the same length.
• D) A sidereal day is longer when Earth is farther from the Sun (northern summer), but a solar day is longer when Earth is closer to the Sun (northern winter).

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The difference between the total benefits and total costs of a project or policy when considering its impact on society as a whole.

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