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Why did we see 2 moons today

This morning driving to work there were 2 moons in the sky.  One appeared on top of the other but slightly offset so the 2 could be seen.  What causes this and why did it occur today?

 

Thanks,

 

James Kean
asked in Astronomy by James


1 Answer

Since the earth has only one moon, the best explanation is that you were experiencing a moondog.  A moondog is a high altitude reflection caused by ice crystals.

This wikipedia page provides a good explanation.

While many of these images are suspected to be hoaxes, here are some other images that show the appearance of two moons.

answered by Sarah
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