The equinox

Question

The equinox

BlackTom AI · Accepted Answer

The question concerns the equinox and asks you to evaluate each statement.
Option 1: 'is the longest day of the year at any given place.' This is false. The longest day occurs at the summer solstice for a given hemisphere, not at the equinox.
Option 2: 'occurs when the subsolar point is at one of the tropics.' This is incorrect. The subsolar point being at the Tropic of Cancer or Tropic of Capricorn corresponds to solstices, not equinoxes.
Option 3: 'has 12 hours of daylight and 12 hours of darkness for all locations on Earth.' This is the conventional description of an equinox, when the Sun is crossing the celestial equator and roughly equal day and night lengths occur globally. In practice, the exact 12-hour equality can be affected by atmospheric refraction and local horizon geometry, so some places may experience slightly more or less than 12 hours, but the standard teaching is that day and night are approximately equal on equinoxes.
Option 4: 'occurs four times during the year.' This is incorrect. There are two equinoxes per year (vernal/spring and autumnal/fall), not four.
In summary, Option 3 is the one that aligns with the common description of an equinox, while the others describe solstices or incorrect characteristics. The idea that equinoxes produce universally exact 12/12 across every location is the main nuance to keep in mind, which is why some sources note it as approximately 12 hours rather than exact for all places.

GEOG121 -LEC Weather and Climate (XL) EXAM I

The equinox

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