Statements (23)
| Predicate | Object |
|---|---|
| gptkbp:instanceOf |
astronomer
|
| gptkbp:advantage |
erect image without additional optics
no chromatic aberration |
| gptkbp:builtBy |
gptkb:Robert_Hooke
|
| gptkbp:designInfluence |
gptkb:Cassegrain_telescope
|
| gptkbp:feature |
erects image
longer tube than Cassegrain |
| gptkbp:firstBuiltYear |
1673
|
| gptkbp:focusArea |
behind primary mirror
|
| https://www.w3.org/2000/01/rdf-schema#label |
Gregorian telescope
|
| gptkbp:introducedIn |
1663
|
| gptkbp:inventedBy |
gptkb:James_Gregory
|
| gptkbp:mirrorMaterial |
metal (historically)
|
| gptkbp:namedAfter |
gptkb:James_Gregory
|
| gptkbp:primaryMirrorDiameter |
concave
|
| gptkbp:primaryUse |
gptkb:astronomy
solar observations |
| gptkbp:type |
astronomer
|
| gptkbp:usedIn |
early observatories
solar telescopes |
| gptkbp:usesSecondaryMirror |
concave
|
| gptkbp:bfsParent |
gptkb:astronomer
|
| gptkbp:bfsLayer |
4
|