The day and night have equal lengths on

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The question asks about when the day and night are of equal length. This occurs at the times of year known as the equinoxes.
Option 1: 'the Winter Solstice and the Summer Solstice' — The solstices mark the longest and shortest days, not equal day and night lengths. This option mixes two solstices, which does not describe equal day and night.
Option 2: 'the spring Equinox and the fall Equinox' — These are precisely the two moments in the year when the lengths of day and night are approximately equal due to the tilt of the Earth's axis relative to its orbit around the Sun. This aligns with the definition of equinoxes.
Option 3: 'the spring Equinox only' — While the spring equinox has nearly equal day and night, there is also the fall equinox in the year. Limiting it to only spring ignores the second instance of equality in the autumn.
Option 4: 'the Winter Equinox and the summer Equinox' — There is no such thing as a winter or summer equinox in the common astronomical terms. The standard terms are spring and fall equinoxes, so this option describes nonexistent or misnamed events.
Option 5: 'the Winter Solstice only' — The winter solstice is the shortest day of the year, not when day and night are equal. This option contradicts the defining feature of an equinox.
Across these choices, the concept hinges on identifying equinoxes as the times with equal day and night lengths, while recognizing that solstices denote extremes of daylight, not equality.

ASTRON 2140 AU2025 (23428) Quiz 1 - 2025 Sep 19

The day and night have equal lengths on

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