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The world's oldest working planetarium (天文馆) is in the Netherlands. It is in the living room of a small, two-story house. The house to Eise Eisinga. He built this model of the solar system (太阳系) to show people how it worked.
In 1774, people were all afraid of the end of the earth. A small book said it would happen May 8. Eisinga decided to build a planetarium to tell people the end of the was not true. He expected to finish the planetarium in six months, but it took him seven years.
Today the planetarium is still working well. Year after year, it keeps telling people that science is the best and tool to explore (探索) the world.
