About: http://webisa.webdatacommons.org/416373878

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	More often than not, it took redoing the calculations over and over before they could be sure exactly where a comet or other space object was headed and how fast.
http://www.w3.org/ns/prov#wasQuotedFrom	authorsden.com