Year 2 Lunation 8

Y2-L8You may notice the names of planets come up once in a while, as above with Venus 2. This refers to the synodic period of the planet i.e. the time it takes to travel from a fixed point in the sky around its path and back to that point as seen from earth. This is different that its orbital period. As with the moon. It takes the moon 27-28 days to orbit the earth, but it takes 29.53 days for it to go from new moon to full to new.

Here’s Venus at the equivalent of new moon, where the planet is invisible, as it passes between the Earth and Sun. It takes about 584 days for Venus to return to inferior conjunction again.


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