Yes that's correct. So I remember when I was in the UK a few years back, we used to have Ramadhaan in the winter, meaning the days very short and fasts very easy (No food, drink, intercourse). Currently in the UK due to fly back in a couple of weeks, I fasted the month of Ramadhaan here in London, where it is summer, days are long, and fasts much harder. So yeah, it varies each year, brings it back about 11 or 12 days each year.
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I hope that answered the question, feel free to ask anymore though
I'm going to take you up on that offer to ask more questions...
If I understand this correctly then, the Islamic calendar has nothing equivalent to a leap day or a leap month to keep the months more or less aligned to the solar year? So every 30+ years it cycles back around?