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From CClassical Times, Sumerians, Egyptians, Greek, Romans, observed the sky. However, teh yall thought the Earth was the centre of the Universe. They saw the planets (and stars ; Sun and Moon included) moving in a regular order.

However the polish astronomer Coperincus, calculated that the system helio-centric ( The Sun at the centre) in 1543.A.D.

This was confirmed by Galileo, who made astronomic observations.

At the time it caused great consternation in the Church . Galileo was 'locked-up' for heresy.

They all agreed on the given planetary alignment of the then known planets, Mercury, Venus, Mars, Jupiter and Saturn.

Uranus was discoveredd in 1781, by Sir William Herschel, and 'outside' the other planets

Neptune was discoveredd in 1840, by Johann Galle, Urbain le Verrier John Couch Adams, and 'outside' the other planets

Pluto was discoveredd in 1930 , by Clyde W Tombaugh and 'outside' the all other planets

Nomenclature; from Classical Greek mythology.

Uranus, The God of the Sky,

Neptune ; The God of the Sea

Pluto ; The God of the Underworld.

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lenpollock

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