Julian years and J2000 Epoch (astronomy)

^ see nasa jet propulsion laboratory spice toolkit documentation, function j1900.
^ cite error: named reference sofa invoked never defined (see page).
^ aoki, s.; soma, m.; kinoshita, h.; inoue, k. (december 1983). conversion matrix of epoch b 1950.0 fk 4-based positions of stars epoch j 2000.0 positions in accordance new iau resolutions . astronomy , astrophysics. 128 (3): 263–267. bibcode:1983a&a...128..263a. issn 0004-6361. 
^ seidelmann, p. k., ed. (1992). explanatory supplement astronomical almanac. sausalito, ca: university science books. p. 8.
^ seidelmann, p. k., ed. (1992). explanatory supplement astronomical almanac. sausalito, ca: university science books. glossary, s.v. terrestrial dynamical time.
^ article uses 24-hour clock, 11:59:27.816 equivalent 11:59:27.816 am.