Double Rainbow Dominates Boston Skyline

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Who doesn't love a double rainbow? Hard not to think of this guy when they decide to show themselves in our skies.

Well with rain over the harbor and the sun heading down in the west, we had the perfect recipe for a photogenic double-rainbow that lit up the skyline and the internet. There's no way these things go unnoticed in this day and age. What's the difference between a regular rainbow and a double rainbow? Well in the case of a single one, light enters a water droplet, is refracted (or 'bent') as it hits the back of the droplet, and bounces out. This scatters wavelengths of light into the elements of the visible spectrum, all spaced out at different angles just enough for us to see the rainbow. A double rainbow occurs when some of the light is refracted (or bounces) twice inside the droplet before exiting. This also acts like a mirror, 'flipping' the rainbow so to speak. So while red is on the top of the primary rainbow, it's on the bottom of the secondary rainbow.

Without further ado, let's go to the photos! A beautiful end to the week in our fair city.

• Boston