Accuracy disputes from November 2015

thumb|The Holy Spirit coming from both the Father and the Son, detail of the Boulbon Altarpiece, . Originally from the high altar of the Chapelle Saint-Marcellin, Boulbon, France, now in the [[Louvre, Paris.]]

thumb|250px|Works Progress Administration|WPA poster, 1936–38

system of measurement developed for use in astronomy