From these measurements Dr. P.V. Neugebauer from Berlin and M.S. Mello and Simas from Trafaria (Lisboa) had independently determined the first orbital elements.
Jointly with the American Assyriologist Abraham Sachs, he published Mathematical Cuneiform Texts in 1945, and this has remained a standard English-language work on Babylonian mathematics.
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Thus, the Jewish calendar was derived by combining the 19-year cycle using the Alexandrian year with the seven-day week, and was then slightly modified by the Christians to prevent Easter from ever coinciding with Passover.