About: http://webisa.webdatacommons.org/423781861

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	what is amazing about all of this is that the inconstant length of day has been known since the time of Claudius Ptolemy (ca. 150 AD), although the reasons for them were a mystery.
http://www.w3.org/ns/prov#wasQuotedFrom	timezone.com