Jacob's thigh was disabled by the Angel, to show the patriarch that his prevalence was through his faith and prayer, not through force, Genesis 32:25-31. Smiting the thigh was a gesture of self-condemnation and grief, Jeremiah 31:19 Ezekiel 21:12.
In general, a datum is a base elevation used as a reference from which to reckon heights or depths. A tidal datum is a standard elevation defined by a certain phase of the tide.
Meades Ranch Triangulation Station, fundamental station for the North American Datum of 1927. The North American Datum (NAD) is the datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the earth along with an anchor point for the coordinate system.he North American Datum of 1983 is based on a newer defined spheroid (GRS 80); it is an Earth-centered (or  geocentric ) datum having no initial point or initial direction.