[1] [CITE@ja[天文時計 - Wikipedia]]
([TIME[2017-07-04 23:32:28 +09:00]])
<https://ja.wikipedia.org/wiki/%E5%A4%A9%E6%96%87%E6%99%82%E8%A8%88>

[2] [CITE@en[Astronomical clock - Wikipedia]]
([TIME[2018-06-27 13:13:41 +09:00]])
<https://en.wikipedia.org/wiki/Astronomical_clock>