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The 41 pages that link to Telescope, each with the reason it gives.

• Focal lengthRelated: Its objective focal length helps determine image scale and, with the eyepiece, magnification.

• Charles MessierRelated: Messier relied on telescopic observations to locate and describe faint objects.

• Equatorial coordinate systemRelated: Equatorial coordinates can direct a telescope toward a target on the sky.

• Geometrical opticsRelated: Its objective and eyepiece are analyzed as a sequence of ray-forming elements.

• TheodoliteRelated: The theodolite’s telescope aims at a target whose direction is measured.

• Rayleigh criterionRelated: A telescope’s aperture predicts the smallest stellar separation resolved by the criterion.

• History of astronomyRelated: Telescopic observation opened celestial details inaccessible to unaided vision.

• LensRelated: Its objective lens gathers light and forms an image for observation.

• Convex lensRelated: Refracting telescopes use a convex objective to form an image of a distant object.

• EyepieceRelated: A telescope eyepiece sets the magnification and apparent field used for visual observing.

• Star chartRelated: A chart can guide a telescope toward targets too faint to see unaided.

• AlidadeRelated: Telescopic alidades replace open sights when precise targeting is needed.

• AstronomerRelated: Telescopes gather faint signals that astronomers use to measure the universe.

• Focus (optics)Related: Its objective optics bring distant-source light to a focal plane.

• History of glassRelated: Improved glass lenses changed astronomy by making faint and distant objects visible.

• Thin lensRelated: The thin-lens model explains focusing by its objective and eyepiece.

• Astronomy (magazine)Related: Equipment articles help readers choose and use telescopes for observing.

• AutocollimatorRelated: Telescope optics supplied techniques and components later used in autocollimators.