Time Twice a Year When Day and Night Are Equal
Puzzle 20 of Animation Pack
Question is: Time Twice a Year When Day and Night Are Equal
and the answer is: EQUINOX
Word Meaning:
EQUINOX — One of two times in the year (one in March and the other in September) when the length of the day and the night are equal, which occurs when the sun is directly overhead at the equator; this marks the beginning of spring in one hemisphere and autumn in the other.
Definitions from Wiktionary.