Is there a variation in optimum Dish elevation with the seasons????

I seem to recall, quite recently in some thread or other, that there could be a benefit from making a slight variation to the dish elevation angle during some months of the year.

That intrigued me because I would have thought that with most sats being geostationary then the angle would be constant throughout the whole year - or is it maybe something to do with the Earth "wobbling" on its rotational axis, &/or some other factor(s)?

I'd not heard of this before and would...

Is there a variation in optimum Dish elevation with the seasons????