„The Astronomical Almanac Online — Glossary”. asa.hmnao.com (на језику: енглески). Архивирано из оригинала 21. 10. 2020. г. Приступљено 23. 4. 2020. „Julian date (JD): the interval of time in days and fractions of a day, since 4713 B.C. January 1, Greenwich noon, Julian proleptic calendar. In precise work, the timescale, e.g., Terrestrial Time (TT) or Universal Time (UT), should be specified.”
iau.org
"Resolution B1". (1997). XXIIIrd General Assembly (Kyoto, Japan). International Astronomical Union, p. 7.
web.archive.org
„The Astronomical Almanac Online — Glossary”. asa.hmnao.com (на језику: енглески). Архивирано из оригинала 21. 10. 2020. г. Приступљено 23. 4. 2020. „Julian date (JD): the interval of time in days and fractions of a day, since 4713 B.C. January 1, Greenwich noon, Julian proleptic calendar. In precise work, the timescale, e.g., Terrestrial Time (TT) or Universal Time (UT), should be specified.”
