The union of the full moon and the full-grown Sun is one form — the astronomical — of that sacred marriage which in many parts of the ancient world was celebrated at midsummer. This union, we suggest, is symbolised by the marriage of Pelops and Hippodameia.
Harrison argues that the marriage of Pelops and Hippodameia encodes the sacred astronomical union of sun and moon that structured the ancient octennial Olympic calendar.
, Themis: A Study of the Social Origins of Greek Religion, 1912thesis