Brass, which is an alloy of copper and zinc, has been used since at least the 10th century BC in Judea and by the 7th century BC in Ancient Greece. Zinc metal was not produced on a large scale until the 12th century in India and was unknown to Europe until the end of the 16th century.any alloys contain zinc, including brass, an alloy of copper and zinc. Other metals long known to form binary alloys with zinc are aluminium, antimony, bismuth, gold, iron, lead, mercury, silver, tin, magnesium, cobalt, nickel, tellurium and sodium.
The stars move parallel to each other and the Celestial Equator. Since the Celestial Equator is on the Horizon, each star has constant altitude. No star rises or sets; all stars are circumpolar.
When they do travel, most of these animals do so in a direction determined by their body's central axis, defined by the location of their mouths. Think of a jellyfish moving up and down in the water column. This is why brittle stars are strange.