Which term describes the event when day and night are approximately equal length?

• A. Solstice
• B. Celestial Event
• C. Equinox
• D. Eclipse

Answer: (C)

The event when day and night are about the same length is called an equinox. This happens twice a year as Earth’s tilt aligns with the Sun in such a way that the Sun is positioned over the celestial equator. On these days, the Sun rises near due east and sets near due west, giving roughly 12 hours of daylight (though exact times vary by latitude and atmosphere). The name comes from Latin for “equal night.”

Think of the other terms as different ideas: a solstice is when the Sun is at its extreme position in the sky, giving the longest or shortest day of the year; an eclipse is when one body blocks another’s light, changing visibility rather than day length; and a celestial event is any notable occurrence in the sky, not a specific description of day-night balance.