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.
Virgo is the sixth astrological sign in the Zodiac. Virgo is the second-largest constellation. It spans the 150-180th degree of the zodiac. Under the tropical zodiac, the Sun transits this area on average between August 22 and September 22, and under the sidereal zodiac, the sun transits the constellation of Virgo from September 17 to October 17.