[1] [CITE@ja[暦Wiki/[[米国暦]] - 国立天文台暦計算室]]
([TIME[2019-06-28 20:49:37 +09:00]])
<https://eco.mtk.nao.ac.jp/koyomi/wiki/CAC6B9F1CEF1.html>

[2] [CITE@en[History of The Astronomical Almanac]]
([TIME[2019-08-10 21:01:24 +09:00]])
<https://aa.usno.navy.mil/publications/docs/asa_history.php>