Confirmed.

The moon jumps every hour on 33rd minute?

execute this in debug console:

setDate [1900,5, 31, 21, 0];
0 setovercast 0;

• spawn {

for "_i" from 0 to 10000 do {
skiptime 0.01;
sleep 0.01;
hintsilent str date
}
}

Moon goes backward on stars background a bit in reality just like shown. But of course its movement isn't that jerky.

prykpryk, I think I might know what you are talking about, that's interesting. This bug also takes place in arma 2 as well. Didn't check in arma 1. Maybe it's some kind of feature but not implemented fully. Thanks for checking guys!