Assertion: keplerian telescope | /r/HasProperty | invented as improvement
Facets:
value: over the galilean telescope
type: LOCATION
value: in 1611
type: TEMPORAL
value: by johannes kepler
type: OTHER
Source sentences:
text: The Keplerian telescope was invented by Johannes Kepler in 1611, as an improvement over the Galilean telescope invented by Galileo in 1609.