In vanilla, meteor showers have a fixed chance of happening each day at a rate of 0.7% chance.
This mod allows you to customize that chance, and make it either a fixed rate, or make it linear/exponential which increases daily until one occurs, at which point it resets.
You can also set a cap on the rate, so it never exceeds a certain point.
You can disable meteor showers by setting the rate cap to 0%.
chance = rate
Setting this to 100% will guarantee a meteor shower every day.
chance = days_since_last * rate
chance = rate ^ (-days_since_last) - 1
v64