Rivers were used to turn watermills and the Romans even used geothermal water for heating. Until the middle of the 18th century renewable sources of energy were the only forms of energy available, but then, with the advent of the Industrial Revolution, fossil fuels began to be exploited.
The Sidereal Zodiac is the position of the sun referenced against the star background, as a measure of the flow of time. The framework for the star background is the constellations the sun passes in front of. This is the one astronomers use.
In the tropical zodiac, the Sun meets Libra from September 23 to October 23, and in the sidereal zodiac, it ends on November 15. Libra, (The Scales of Balance), is the only symbol of the zodiac that is inanimate (it is not represented by an animal or person). The opposite sign to Libra is Aries. The corresponding month in the Babylonian calendar is TiÅ¡ritum, made for Shamash (the Sun). Spirit of Libra.