Tycho Brahe's years of astronomical observation were inspired by the appearance of a new supernova and comet, as well as a desire to cast more accurate horoscopes.

Question

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Tycho Brahe was indeed inspired by the appearance of a new star (supernova) in 1572 and a great comet in 1577, which challenged the prevailing Aristotelian belief in the unchangeability of the celestial realm. These events, along with his interest in astrology, motivated him to make more precise astronomical observations to improve the accuracy of horoscopes, among other scientific pursuits.

Tycho Brahe's Years of Astronomical Observation Were Inspired by the Appearance