Zo

Zodiac

The band of the sky extending 8 degrees either side of the ecliptic.

Zodiacal Light

A faint cone of light extending upward from the horizon in the direction of the ecliptic (zodiac).

Zoetrope

An optical toy with a series of pictures that when rotated give the impression of movement.

Zonal Wind

Atmospheric wind component which flows along the latitude.

Zone

Any group of crystal planes that are all parallel to one line, called the zone axis.

Zone of Avoidance

An irregular zone near the plane of the Milky Way where the absorption due to interstellar dust is so great that no external galaxies can be seen through it.

Zone Refining

A technique used to reduce the level of impurities in certain metals, alloys, semiconductors, and other materials.

Zone System

A photographic system of exposure estimation.