天文單位
出自維基百科,自由嘅百科全書
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)

