About: http://webisa.webdatacommons.org/232420665

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	So any direction will do.And when d = 180, then the two points are at opposite ends of the earth, e.g. North and South poles.
http://www.w3.org/ns/prov#wasQuotedFrom	xcomufo.com