  Possibilism has been given slightly different definitions in the literature. However, unlike the different definitions of actualism discussed in the next section, typical definitions of possibilism are essentially synonymous. Patricia Greenspan (1978) does not offer a formal definition of possibilism, but defends the view by way of rejecting Holly Goldman’s actualist principle, referred to as (G*1). Greenspan does so in the process of defending her (1975) view in a related debate concerning whether ought-statements should be dated differently from their objects and about whether they hold from different temporal standpoints. Fred Feldman defines possibilism in terms of possible worlds. Feldman refers to his theory as (MO). As he characterizes (MO), what S is morally obligated to do, “as of a time, t”, is 