What were three of tycho brahe’s reasons for believing his model had to be right? ?

1. He observed a super nova which disappeared after 18 months.

2. He observed a comet which proved that not everything is non-changing and not everything is a circular motion.

3. He measured the movement of planets and stars, couldn't find he parallax, conclusion: the earth is at the center of the universe un-moving.

Explanation:

Tycho Brahe produced a prodigious volume of estimations and observations, but he didn't fabricate or hypothesize any particular model and didn't try to

Danish astronomer Tycho/Tyge Brahe (1546-1601) is immensely important for two reasons: Observing and holding the (rough) distance to a Supernova, thereby revealing that the atmosphere was not a God-given stable sphere, but a dynamic system.

the first, second, and fifth options