Backup diff of 2009-06-21 (No. 2)

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  • 1 (2009-06-21 (Sun) 21:28:16)
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- 【時の記念日企画】「1秒」とはどんな時間なのか?
--  http://kaden.watch.impress.co.jp/docs/column_special/20090616_294077.html
- 日食を観察する方法 (2009年7月22日皆既日食の情報)
--  http://www.nao.ac.jp/phenomena/20090722/obs.html