[1] 世界時 - Wikipedia () <https://ja.wikipedia.org/wiki/%E4%B8%96%E7%95%8C%E6%99%82#.E6.8E.A1.E7.94.A8.E7.B5.8C.E5.BA.A6.E7.B3.BB.E3.81.AE.E7.B5.B1.E4.B8.80.E3.81.A8.E6.85.A3.E7.94.A8.E5.9B.BD.E9.9A.9B.E5.8E.9F.E7.82.B9_.28CIO.29_.E3.81.AE.E6.8E.A1.E7.94.A8>
[2] 採用経度値と極原点 () <http://www.asj.or.jp/geppou/archive_open/1969/pdf/19690508.pdf>