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How bright did Tycho’s Nova become in the sky?

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Painting of Danish astronomer Tycho Brahe wearing a black robe with a white ruffled collar and a gold chain necklace with a large pendant. — Tycho Brahe Tycho Brahe.

Tycho’s Nova, a supernova first observed by Tycho Brahe in 1572, reached an apparent magnitude of approximately −4, making it as bright as the planet Venus. Due to this extreme luminosity, the object was visible to the unaided eye even during the day.12