Emily Dickinson Lexicon

ZO-DI'AC-AL, a.

Pertaining to the zodiac. Zodiacal light, a luminous track of an elongated triangular figure, lying nearly in the ecliptic, its base being on the horizon, and its apex at varying altitudes. In the evening after twilight, it is in this latitude most conspicuous from January to April, and in the morning before dawn, from September to December. Its nature is unknown.