I know this may be extremly basic to almost everyone on the forums, but I really can't tell if moon cycles are predictable or not ! like can we tell in advance when is the full moon ? I feel like the answer sould be a definite YES, but my confusion is based on what I see each year. I live in an islamic country, and each year the first day of ramadan is marked by a full moon which indicates the new lunar month, but almost each year, people have to gather with their telescopes looking for the full moon, and what's even worse, someyimes sightings in different countries are different, so they have the first day of ramadan on a different date and that doesn't make any sense for me ! so as simple as this question can be: Can we predict accuratly moon cycles ?