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| As with the moon, the Babylonians conducted observations of the planets with reference to the ecliptic(link). The planets moved along the ecliptic through the years in the same direction of the sun, and eventually completed one trip around it. After this they would exhibit the same phenomena at the same times as the previous cycle. However for a stretch of their orbit the planets would appear to change directions against the sun, in a phase called retrogression. Thus the Babylonians determined the beginning and ending points of each planet' | As with the moon, the Babylonians conducted observations of the planets with reference to the ecliptic(link). The planets moved along the ecliptic through the years in the same direction of the sun, and eventually completed one trip around it. After this they would exhibit the same phenomena at the same times as the previous cycle. However for a stretch of their orbit the planets would appear to change directions against the sun, in a phase called retrogression. Thus the Babylonians determined the beginning and ending points of each planet' | ||
| - | == Determining the fundamental period == | ||
| - | The Babylonians were primarily interested in the two points in a planet' | + | |
