About: http://webisa.webdatacommons.org/28508224

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	Orbits are not circular, they are elliptical, so it is not that there is a center, it is that there are two foci, and the planet is at one of them.
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org