Metonic Calendar -- Named for the Athenian astronomer Meton, it is based on the moon, counting each cycle of the phases of the Moon as one month.
(Metonic Calendar; Named; for the Athenian astronomer) (it; is based; on the moon) (Meton; [is] astronomer [from]; Athens)
Metonic Calendar it Meton
Named is based [is] astronomer [from]
for the Athenian astronomer
on the moon
Athens