天文單位

出自維基百科，自由嘅百科全書

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天文單位，由英文astronomical unit譯過來，符號AU、au、a.u.或者ua等等。天文單位係個長度單位，大約係地球同太陽之間嘅遠。家下多數當佢係1495萬9787萬0691米，上下差30 米，即係1萬5千萬千米。

[編輯] 出面網頁

• Chasing Venus, Observing the Transits of Venus Smithsonian Institution Libraries
• Units outside the SI (at the NIST web site)
• Recommendations concerning Units (at the IAU web site)
• Solar Mass Loss, the Astronomical Unit, and the Scale of the Solar System (a discussion of the relation between the AU and other quantities)