The choice of which community or authority to follow is also a personal preference. People often express their preferences in a way that aligns them tribally in one sphere or another when given the choice, and the lunar calendar is (humorously) not an exception to that.

There are no central authorities, only a menu of organizations and traditions that one can choose from. In some cases there is social pressure to choose one, and that social pressure is sometimes intense enough so that it feels like there is a central authority.