Idk, probably my last comment here since I don't want to extend this discussion too much
Because it's through the power of the necrosword

ya know the weapon he wields... sorta like how Mjonir and Stormbreaker are
So? Just because Gorr theoretically uses a sword to control a star does not mean that a physical attack with that same sword is capable of generating the same yield as when it is used to move a celestial body. One thing has nothing to do with the other. The guy literally moved the thing to create shadows, that's all. To assume that Gorr is capable of attacking with that level of power with any attack is beyond absurd
The Mjonir and Stormbreaker have no comparison to anything here, everything they do is through physical impact, and not telekinesis or some completely vague power used to summon creatures
Sure but that's all you'd have there is an assumption we can't say anything more beyond that so I won't speak on it
"But then it's an assumption"
At the same time, you use an assumption to say it is a star comparable to our sun

I know we have standards, but come on, the planet is not even 500 meters in diameter
Writers being shit at science doesn't discredit the feat
I'm not ignoring the feat because they don't care about science, what I'm saying is that the problem with the perspective of the planet can be justified with that. Or rather, it doesn't even need to, since the perspective we have of the planet is the same as that of the heroes, who are on the planet, so us seeing the thing having a "slow" rotation definitely wouldn't be a problem. it's the "same" case we have with our world, the shit spins at 1670 km/h, and we don't even notice