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(TWO PRINTS of Eise Eisinga Planetarium in Franeker ) Schynbare beweging der zon en vaste sterren) |
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Description
Engraved by B.W. Dietz after a design by K.J.Sannes. One of these plates was drawn by a friend of Eisinga, Klaas Johannes Sannes.
A folded version ofthe plate was included in "J H van Swinden's beschrijving van een kunststuk, verbeeldende een volledig bewegelijk hemelsgestel: (planetarium) uitgedacht en vervaardigd door Eise Eisinga" by Jan Hendrik van Swinden (1746-1823).
Eise Jeltes Eisinga (21 February 1744 – 27 August 1828) was a Dutch amateur astronomer who built the Eise Eisinga Planetarium in his house in Franeker. The orrery still exists and is the oldest functioning planetarium in the world.
On 8 May 1774, a conjunction of the moon and the planets Mercury, Venus, Mars and Jupiter was forecast to appear. Reverend Eelco Alta, from Boazum, Netherlands, published a book in which he interpreted this as a return to the state of the planets at the day of creation and a likely occasion for Armageddon. Alta predicted that the planets and the moon would collide, with the result that the earth would be pushed out of its orbit and burned by the sun.
Due to this prediction there was a lot of panic in Friesland.
The canonical view holds that Eisinga decided to build an orrery in his living room to prove that there was no reason for panic. He expected to finish it within six months and eventually finished it in 1781, seven years after he started. During the same year, Uranus was discovered, but there was no room for this planet on the ceiling of his living room, where the orrery was located.
However, recent research indicates that this chain of causality is dubious, not in the last place because Eijsinga appears to have commenced construction before the publication of Alta's book.
The construction of the orrery saved Eijsinga a lot of time, however, because he no longer needed to calculate the planets' respective positions by hand.
On 30 June 1818, King William I of the Netherlands and Prince Frederik visited the orrery. King William I bought the orrery for the Dutch state. In 1859, the orrery was donated by the Dutch state to the city of Franeker.
Reference: Planetarium-boek Eise Eisinga (1928), 149-53.
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