Un arcobaleno a 360 gradi

Oggi proponiamo una foto molto spettacolare che ritrae un arcobaleno doppio completo a 360 gradi ripreso un Norvegia. Il centro della ruota è il punto opposto al Sole, che generalmente è posto sotto all’orizzonte, ma in questo caso è ben visibile perché la foto è stata scattata in volo.

Ecco la didascalia dell’autore: Lukas Moesch: “Have you ever seen an entire rainbow? From the ground, typically, only the top portion of a rainbow is visible because directions toward the ground have fewer raindrops. From the air, though, the entire 360-degree circle of a rainbow is more commonly visible. Pictured here, a full-circle rainbow was captured over the Lofoten Islands of Norway in September by a drone passing through a rain shower. An observer dependent phenomenon primarily caused by the internal reflection of sunlight by raindrops, the rainbow has a full diameter of 84 degrees. The Sun is in the exact opposite direction from the rainbow’s center. As a bonus, a second rainbow that was more faint and color-reversed was visible outside the first” (cit. APOD -NASA).