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中国牧夫天文论坛网站成立于1999年3月。是中国大陆成立最早也是规模最大的天文论坛网站，注册用户近16万人(2012年3月)，几年来发表文章和帖子百万篇。为中国大陆、港澳台和海外华人天文爱好者所推崇。
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Get the latest space exploration, innovation and astronomy news. Nssa.vip celebrates humanity's ongoing expansion across the final frontier.
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Calculator City, calculators for algebra, geometry, trigonometry, calculus, finance, astronomy, physics, chemistry, time cards, HTML Colors, percentages, fractions
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