DÃªmÃªtÃªr (Greek: , "mother-earth" or perhaps "distribution-mother", perhaps from the noun of the Indo-European mother-earth *dheghom *mater) is the Greek goddess of grain and agriculture, the pure nourisher of youth and the green earth, the health-giving cycle of life and death, and preserver of marriage and the sacred law. She is invoked as the "bringer of seasons" in the Homeric hymn, a subtle sign that she was worshiped long before the Olympians arrived. The Homeric Hymn to Demeter has been dated to sometime around the Seventh Century BC.Nilsson, p.45: "We have a document concerning the Eleusinian cult which is older and more comprehensive than anything concerning any other Greek cult, namely, the Homeric Hymn to Demeter composed in Attica before Eleusis was incorporated into the Athenian state, not later than the end of the seventh century B.C.
Demeter (Detection of Electro-Magnetic Emissions Transmitted from Earthquake Regions) is a CNES micro-satellite launched in 2004 with a 2-year planned lifetime, for developing earthquake prediction. The satellite measures ionospheric disturbances like ion density and extremely low frequency (ELF) changes in the Earth's magnetic field.