(Κιδήνας; Kidḗnas, Babylonian Kidinnu), Chaldean astronomer, at the latest in the 2nd cent. BC, mentioned by Strabo as well as Sudines and Naburianus, discoverer of the equation 251 synodic months = 269 anomalistic months, originator of system B of the Babylonian moon calendar. His observations were probably used by Critodemus (CCAG 5,2,128,15), Hipparchus  and Ptolemaeus.
P. Schnabel, Berossos und die babylon.-hell. Lit., 1923, 121-130
O. Neugebauer, Astronomical Cuneiform Texts, 195…