Yes, Muslim use a Moon calendar (11 days short of a solar year) where the month is 29 or 30 days, there are 12 months, Ramadan is actually a month name followed by Shawal.
Ramadan migrate through a solar calendar; one complete cycle every 33 years, Muslim experience fasting in different seasons: summer where the day is long and the weather is hot, and winter where days are short and the weather is great for fasting.
It's been done for a long time so it has to be legitimate!
We should give up on democratic process and pasteurization because they are so old.
I swear, when docker and lxc turn ten, I will uninstall them and never look back.