from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A faint hazy cone of light, often visible in the west just after sunset or in the east just before sunrise, apparently caused by the reflection of sunlight from meteoric particles in the plane of the ecliptic.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A soft glow of white light extending upward from the horizon along the ecliptic, particularly in the tropics.
from the GNU version of the Collaborative International Dictionary of English
- adj. a luminous tract of the sky, of an elongated, triangular figure, lying near the ecliptic, its base being on the horizon, and its apex at varying altitudes. It is to be seen only in the evening, after twilight, and in the morning before dawn. It is supposed to be due to sunlight reflected from multitudes of meteoroids revolving about the sun nearly in the plane of the ecliptic.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a luminous tract in the sky; a reflection of sunlight from cosmic dust in the plane of the ecliptic; visible just before sunrise and just after sunset
Sorry, no etymologies found.
Also promising to occupy the crew during their scheduled seventy-hour, fifty-five-orbit flight were onboard experiments involving zodiacal light photography, frog egg growth, synoptic terrain photography, nuclear emulsion, and atmospheric cloud spectrophotography.