Zodiacal Constellations. Those constellations lying in a zone about H° on either side of Ecliptic, and from which the Signs of the Zodiac take their names. The signs do not now agree with the constellations of the same names; this being due to precession of the equinoxes.
Zodiacal Light. A long, tapering, and narrow beam of faint light that is sometimes to be seen coming upwards from Sun before he rises, or after he has set.
Zone. Area between two parallel circles of a sphere. In a more general sense, it may mean an area on the surface of a sphere. See 'Seasonal Zones'.