About: http://webisa.webdatacommons.org/87634332

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	David Rodger October 1, 2009 at 10:43 am A few weeks ago there was an occasion when all four Galilean moons were ???invisible??? for a few hours.
http://www.w3.org/ns/prov#wasQuotedFrom	skyandtelescope.com