Credit & Copyright: Bernd Thinius
(Inastars Observatory Potsdam)
Explanation:
Where is the Sun when you see a rainbow? Behind you, of course. But you can see
both a rainbow and the Sun (far right) side by side in this graceful panorama
recorded on July 28. The cloudy sunset view covers a full 360 degrees around
the horizon, composed using 20 individual images taken from an observatory on
the outskirts of Potsdam, Germany. The rainbow itself is produced by sunlight
internally reflected in rain drops from the direction opposite the Sun back
toward the observer. As the sunlight passes through the drops, from air to
water and back to air again, longer wavelengths (redder colors) are refracted
or bent less than shorter wavelengths (bluer colors), separating the sunlight
into the colors of the rainbow. This sharp picture captures the full, bright,
primary rainbow arc as well as more subtle effects. You can see a partial,
dimmer, secondary rainbow arc above and left of the primary, and faint arcs
just inside the primary rainbow called supernumerary rainbows.
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