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.
Aries (â) /ËÉÉriËz/ (meaning ram) is the first astrological sign in the zodiac, spanning the first 30 degrees of celestial longitude (0Â°â¤ Î» <30Â°). Under the tropical zodiac, the Sun transits this sign mostly between March 21 and April 19 each year. This time duration is exactly the first month of Solar Hejri calendar (Farvardin). Under the sidereal zodiac, the sun currently transits Aries from April 15 to May 14 (approximately).