Just finished testing Asahi; the latest version of the mod is compatible with Minecraft 1.21.5-1.21.10 including the versions it was already working in (1.21.2+). Additionally I suspect it'll work in 1.21.11 as it worked in the latest pre-release.
get it here: modrinth.com/mod/asahi
modrinth.com
Asahi - Minecraft Mod
Remove jittering of the moving sun caused by client desync!