the super Moon

It looks like the atrocious weather of today will clear just in time for us to see the super Moon we’ve been promised.

The Moon’s orbit around the Earth is slightly elliptical. At its closest point (called perigee), the Moon is 50,000 kilometres closer to us than at its furthest point (apogee). The Moon’s perigee coincides with full Moon about once every eighteen years. The full Moon will be 14% bigger than it is when the Moon is at its furthest from us.

On Earth, the tides are highest when the Moon is full or new, when Moon and Sun pull the Earth’s oceans in the same direction (see also here). A ‘super’ perigee Moon increases the level of high tide by a few centimetres. That’s all. It does not cause disasters, as some people have claimed. Unless, perhaps, you’re a werewolf…

3 comments on “the super Moon

  1. Bugger its getting cloudy here. Wonder if we will get a rash of news reports about the effects of a super moon on emergency room rates.

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