My family and I live in Australia and every year have issues with sighting the moon; we follow the rulings of Sayed Sistani. This year we learned about Sayed Khoei’s ruling for the sighting of the moon which makes more sense to us. As a precaution, we are travelling so as to avoid fasting on Eid or not fasting Ramadan. My question is, can we take the ruling of a different marja for the sighting of the moon, or must we follow Sayed Sistani on this?