The universalia in re have little place in his thoughts, which are directed by preference to the eternal exemplars as they exist in the supersensible world of the divine thought.
In general, Aquinas maintained in different senses the real existence of universals ante rem, in re and post rem.
In the 5th century B.C. the Athenian astronomer Euctemon, according to Geminus of Rhodes, compiled a weather calendar in which Aquarius, Aquila, Canis major, Corona, Cygnus, Delphinus, Lyra, Orion, Pegasus, Sagitta and the asterisms Hyades and Pleiades are mentioned, always, however, in re Corvus.
The form exists concretely in the individual things (sensibilis in re sensibili), for in sensible things form and matter are always united.
Kennedy; In re Walt Whitman (Philadelphia,1893) edited by his literary executors, H.