• The United States Naval Observatory
  
  The USNO mission is to determine thepositions and motions of celestial objects, to provide astronomicaldata, to measure the Earth's rotation and to maintain the Master Clockfor the United States.
  astrometry astronomy atomic clocks earth global gps orient positioning precise satellite system time timetransfer two-way twstt
  By rrhobbs in Public bookmarks with astronomy navy observatory reference science space time by 3 users
• 揭開星空的奧秘 - 觀天術
  By alanpoon in Public bookmarks with astronomy databases development educational-organization histories liberal-studies science space technologies 天文 太空 教育組織 歷史 發展 科學 科技 資料庫 通識
• AEEA 天文教育資訊網
  By alanpoon in Public bookmarks with astronomy databases development educational-organization histories liberal-studies science space technologies 天文 太空 教育組織 歷史 發展 科學 科技 資料庫 通識
• NOVA | Watch NOVA Programs Online | PBS
  By alanpoon in Public bookmarks with astronomy biology broadcast earth health histories liberal-studies mathematics nature physics science space teacher technologies videos 健康 地球 天文 太空 廣播 by 2 users
• 用教育捍衛地球！
  By alanpoon in Public bookmarks with astronomy biology blogs education environmental-protection geography nature ocean science space teacher tutorials weather 地理 天文 天氣 太空 教學網站 教育 海洋 by 2 users
• 延陵科學綜合室 Acta Scientrium Ngensis
  By alanpoon in Public bookmarks with animals biology chemistry chinese european germany histories japan laws plants science space united-kingdom war 中華 動物 化學 太空 德國 戰爭
• Stellarium
  Stellarium is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
  By vbdata in Public bookmarks with stjärnor by 2 users
• Hubble Heritage Gallery of Images
  By wicksta in Public bookmarks with system:unfiled by 8 users
• Blackhole.swf (application/x-shockwave-flash Object)
  By tpsaint in Public bookmarks with animation astronomy blackhole education flash science space
• The Daily Galaxy: News from Planet Earth & Beyond
  Publishing news and original information in text and video on science, space, technology and popular culture (music, film, scifi)-updated daily and always interesting: "Every Day a New Discovery."
  The Daily Galaxy -Great Discoveries Channel, is an eclectic text and video presentation of news and original insights on science, space exploration, and the environment and their reflections in popular culture (film, books, events).
  change climate environment global science space technology warming
  By tpsaint in Public bookmarks with blog blogs daily geek news online science space by 5 users

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