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Our constant moon?

Not if you take two years worth of moon pictures and put them into a two second film loop.  Freaky. This video is a fantastic articulation of the fact…

Not if you take two years worth of moon pictures and put them into a two second film loop.  Freaky.

This video is a fantastic articulation of the fact that the Moon’s orbit around Earth is not, in fact, a perfect circle, but rather an ellipse (with about 5% eccentricity) which travels closer and then farther away in turn and changing apparent size in the process. The orbit is tilted slightly with respect to Earth’s daily planetary rotation, presenting slightly varying angles, and there is obviously some wobble in the orbital path, which astronomers call libration. In total, we actually see somewhere closer to 59% of the Moon over time rather than what the pedestrian 50% bright-side model would offer.

Or, as Juliet put it …

O, swear not by the moon, the fickle moon, the inconstant moon, that monthly changes in her circle orb, Lest that thy love prove likewise variable.

Or at least wobbly.

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