Initial data
This 1660 illustration describes an observation made by two French ships in the North Sea. The object was moving slowly across the sky. The object turned out to consist of two disks of different sizes.
The source of the observation is taken from the book of the French Admiral Blo "Theatrum Orbis Terrarum".
Original news
Denne illustration fra 1660 beskriver en observation gjort af to franske skibe i Nordsøen. Objektet bevægede sig langsomt på himlen. Objektet viste sig som bestående af to skiver med forskellig størrelse. Kilden til observation er fra bogen "Theatrum Orbis Terrarum" af den franske admiral Bleau.
Hypotheses
Halo
Halo usually appears around the Sun or moon, sometimes around other powerful light sources such as street lights. There are many types of halos, but they are mostly caused by ice crystals in Cirrus clouds at a height of 5-10 km in the upper troposphere. The form of the observed halo depends on the shape and arrangement of crystals. Reflected and refracted by the ice crystals, the light often turns into a spectrum, which makes halo look like a rainbow, but a halo in low light has a low chroma, which is associated with the peculiarities of twilight vision.
Investigation
Resume
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