During a(n) ______, Earth's rotation axis is the most toward or away from the Sun.

During a(n) ______, Earth's rotation axis is the most toward or away from the Sun.

• A. Solstice
• B. Equinox
• C. Tide
• D. Latitude

Answer: (A)

The key idea is that the tilt of Earth's axis relative to the Sun reaches its extreme either toward or away from the Sun only during the solstices. At a solstice, the Sun’s apparent path in the sky reaches its highest or lowest arc, which corresponds to the axis being pointed most toward the Sun (summer solstice) or most away from the Sun (winter solstice). This is what drives the longest and shortest days of the year. During an equinox, the Sun is directly above the equator, and the tilt of the axis is not toward or away from the Sun, so day and night are about equal. A tide is a gravitational effect on ocean waters and isn’t about the Sun-Earth axis orientation. Latitude is just a geographic coordinate and doesn’t describe a moment when the axis aligns most toward or away from the Sun. So, the moment when the axis is most toward or away from the Sun is a solstice.

The key idea is that the tilt of Earth's axis relative to the Sun reaches its extreme either toward or away from the Sun only during the solstices. At a solstice, the Sun’s apparent path in the sky reaches its highest or lowest arc, which corresponds to the axis being pointed most toward the Sun (summer solstice) or most away from the Sun (winter solstice). This is what drives the longest and shortest days of the year.

During an equinox, the Sun is directly above the equator, and the tilt of the axis is not toward or away from the Sun, so day and night are about equal. A tide is a gravitational effect on ocean waters and isn’t about the Sun-Earth axis orientation. Latitude is just a geographic coordinate and doesn’t describe a moment when the axis aligns most toward or away from the Sun.

So, the moment when the axis is most toward or away from the Sun is a solstice.