Which historical supernova, reaching an apparent magnitude of $-7.5 ext{m}$, was bright enough to be visible during the daytime?
Answer
SN 1006
SN 1006 was the brightest historical event listed, achieving an apparent magnitude of $-7.5 ext{m}$, which made it bright enough to be observed during daylight hours and allowed it to cast shadows at night for several days.

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