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- Using Beidou in Europe
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- the receiver computes a location from GPS alone, before a 北
斗 satellite was found by the receiver. It is
- The Great American eclipse
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-
{{fotos:eclips2017:teton01.jpg?200 }} A few days before the eclipse we
flew into Salt Lake City and drove
- Nanjing’s ancient Observatory
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- alled an armillary. The
oldest were made in 1437, before the start of the Ming Dynasty. And
these are copi
