In the Caribbean and Latin America, Shi’ah Muslims are almost as confused as the
Sunni majority. They cannot agree when the month of Ramadan begins and start the fast on different dates. Are we obliged to follow the jurist’s – Marja’a – announcement on the moon being sighted, or obliged to start fasting with the rest of the Muslims here?

You have to start Ramadan when:
a. You personally see the moon.
b. Two just witnesses say that they have seen the moon.
c. When you become sure that the moon has been already seen, because the majority of Muslims claim that it has been.