For how long was Kepler's Supernova (SN 1604) visible during the daytime?
Answer
For several weeks.
Kepler's Supernova, formally designated SN 1604, serves as a historical benchmark for understanding the extreme energy output possible in stellar explosions, particularly those vastly exceeding a standard nova like the expected T CrB event. This supernova was historically notable because it achieved such incredible luminosity that it was clearly observable in the sky even during daylight hours. The text specifies that this exceptional visibility persisted for a duration of several weeks, providing an extended period for contemporary astronomers to study the phenomenon before it eventually faded, unlike the standard nova which brightens suddenly and then diminishes.
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