Pentecost (,
Pentekoste [hemera], "the fiftieth [day]") is the
Greek name for
Shavuot (, lit. "Weeks"), the
Feast of Weeks, a prominent feast in the calendar of
ancient Israel celebrating the giving of the
Law to Moses at Sinai. In Christianity, Pentecost is celebrated fifty days after
Easter Sunday,
inclusively (i.e., 49 days with the first day counted, seven weeks), hence its name. In Judaism,
Shavuot is on the sixth day of the Hebrew month of
Sivan (late May or early June). Pentecost falls on the tenth day after
Ascension Thursday (40 days after Easter).