At a cost of about $1 million, the first planetarium was opened to the public on May 10, 1930.
At a cost of about $1 million, the first planetarium was opened to the public on May 10, 1930.
1930年5月10日，世界上第一座天文台--芝加哥爱德勒天文台以大约一百万美元的造价建成。
At a cost of about $1 million, the first planetarium was opened to the public on May 10, 1930.
1930年5月10日，世界上第一座天文台--芝加哥爱德勒天文台以大约一百万美元的造价建成。