From this page, the interested visitors can join the International Astronomical Center (IAC) or the Islamic Crescents Observation Project (IOCP) or both of them. There are two types of membership; Active Member and Member Friend. The annual fees for Active Member is 10$ per year, whereas there are no fees for Member Friends. The membership application for the Active Member is considered complete once the member pays the annual fees from this page.
The difference between Active Member and Member Friend is that Active Member can represent the center in the international meetings and conferences as well as media interviews. In addition, Active Member will have special benefits during the IAC meetings.