Will Earth hour do damage to power supply system?

Who discovered the world is round.?

• earliest evidence of a spherical Earth comes from ancient Greek(8000 years a go) sources, there is no account of how the sphericity of the Earth was discovered. The correct answer would be Yajnavalkya. Yajnavalkya (c. 9th–8th century BCE) recognized that the Earth is spherical in his astronomical text Shatapatha Brahmana. This is also recognized in another Vedic Sanskrit text Aitareya Brahmana composed around the same time, and in a later Sanskrit commentary Vishnu Purana Pythagoras reached the same conclusion in 540BC. Philolaus of Croton 480-405BC believed that the Earth orbited along with the Sun around a central 'fire'. Several Greeks circa 350BC held the Pythagoras view such as Heraclides Ponticus, Hicetas, and Ecphantus. Aristarchus of Samos 310-230BC believed that the Earth went around the Sun but his views were ignored by the Bishops of the church (who then claimed scientific prowess). Circa 200BC Erasthenes of Cyrene attempted a measurement of the Earth's circumference. It was an inaccuracy by the great mathematician Ptolemy circa 140BC which claimed that the Earth was again at the center of the System and this allowed the church to hold the view for the next 1500 years. Kopernik - Copernicus 1473-1543AD never blatantly challenged the authority of the church. His works were published after church approved 'corrections' and omissions. His last work was published the year of his death. It is only when these facts are brought to light that one can see the true damage done by the Roman Catholic church which tried so long to keep truth secret from people in order to hold power over them. Even if it meant persecuting the innocent. Only about 1/3 of Aristotle's works have survived. He was a great physisist making contributions in the understanding of motion and dynamics among other things. He believed that stars were spheres. However, he also believed that Earth was at the center of the Solar System. It was Galileo who was dramatically persecuted by the church in the 1600's for his scientific and astronomical beliefs which kept science and truth from advancing for many years thereafter.

• Answer:

  It was common knowledge in ancient times that the earth is spherical. Certainly the first sailors on the Mediterranean must have realized that, since the mast of an approaching boat is visible before the rest of the boat. So an understanding of the earth's shape must go back to around 7,000 BCE, long, long before Yaj-whatshisname.