pimennyskaksoistähdiltä

pimennyskaksoi, also known as a lunar eclipse binary, refers to a phenomenon where a lunar eclipse appears to be a binary event. This is not a standard astronomical term and typically arises from observational misinterpretations or specific atmospheric conditions. A true lunar eclipse occurs when the Earth passes directly between the Sun and the Moon, casting a shadow on the Moon. The appearance of a "binary" eclipse can sometimes be attributed to atmospheric effects like refraction, which can distort the Moon's image, making it appear as if there are two distinct objects. Another possibility is the presence of other celestial bodies or bright objects near the Moon during the eclipse, which, when viewed through a telescope or with the naked eye, might be mistaken for a companion to the Moon. In some rare instances, unusual cloud formations or dust in the Earth's atmosphere can create optical illusions that lead to the perception of multiple lunar bodies. Scientific observation of lunar eclipses typically focuses on the single, well-defined shadow cast by the Earth. The term pimennyskaksoi is therefore more likely to be found in informal discussions or historical accounts rather than in formal astronomical literature. Understanding the underlying optical principles and atmospheric conditions is key to correctly interpreting any unusual visual experiences during a lunar eclipse.