About: http://webisa.webdatacommons.org/38384785

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	While it only requires three sources to be able to triangulate a position, there are distortions in space-time around the Earth's gravitational field (as well as small ones introduced by the sun, moon and other planets).
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com