All systems use ratios related to Babylonian astronomy.

Babylonian astronomy - the ancient sources transmitted to Ptolemy.

An authority on Babylonian astronomy and celestial omens.

At the time, Babylonian astronomy was well developed and far in advance of the Greek bare beginnings.

Of Babylonian astronomy, practically nothing was known to historians of science before the 1880s.

Babylonian astronomy was "the first and highly successful attempt at giving a refined mathematical description of astronomical phenomena."

He is most noted for his studies of cuneiform tablets and Babylonian astronomy.

However his full work on Babylonian astronomy was never completed, with only three volumes out of a planned five published.

In particular, they brought the concept of geometry to Babylonian astronomy.

Logic was employed to some extent in Babylonian astronomy and medicine.