Linked from

The 40 pages that link to Astronomical unit, each with the reason it gives.

• ParallaxRelated: Earth’s orbit supplies the baseline for annual stellar parallax.

• Speed of lightRelated: Its exact length connects orbital distance scales to measurements of light travel time.

• AsteroidRelated: Asteroid orbits are often described by their distance from the Sun in astronomical units.

• Stellar parallaxRelated: Earth’s orbital baseline is one astronomical unit from the Sun to either side.

• Earth's orbitRelated: It provides the standard scale for Earth's orbital size.

• PlanetRelated: It provides a familiar scale for comparing distances between planets and their star.

• Mercury's perihelion precessionRelated: Mercury’s orbital scale helps set the size of the relativistic correction.

• VizieRRelated: Catalogue column units determine how VizieR measurements should be interpreted and compared.

• Oort cloudRelated: It provides a familiar unit for expressing the cloud's immense proposed distances.

• Near-Earth objectRelated: Near-Earth classifications are defined using distances measured relative to Earth’s orbit.

• Semimajor axisRelated: It is commonly used to express planetary semimajor axes, but is a unit rather than an orbital property.

• ParsecRelated: This baseline forms the right triangle in the parsec’s geometric definition.

• Light-yearRelated: Comparing it with the light-year shows the enormous scale gap between planetary and interstellar distances.

• Kirkwood gapRelated: Kirkwood gaps are commonly specified by their distances from the Sun in astronomical units.

• Solar luminosityRelated: The Earth–Sun distance connects measured solar flux to total solar power.

• John FlamsteedRelated: Flamsteed’s observations contributed to later efforts to determine the scale of the solar system.

• Kepler's third lawRelated: It provides a convenient distance scale in the Solar System's version of the law.

• Sidereal yearRelated: It expresses the scale of the orbit whose completion defines the year.

• Interplanetary magnetic fieldRelated: Field strengths and solar-wind conditions are often reported at this reference distance.

• Solar massRelated: Together with the gravitational constant, the Sun’s orbit helps determine its mass.

• Astronomical tablesRelated: Table-based predictions of planetary events enabled measurements that refined this distance scale.

• Pioneer plaqueRelated: The spacecraft outline uses this familiar solar-system scale to suggest its size.

• Giovanni Domenico CassiniRelated: Cassini’s coordinated observations helped produce an early estimate of the solar parallax and this scale.

• Friedrich Wilhelm BesselRelated: Earth’s orbit supplies the baseline that made Bessel’s distance measurement possible.

• Simon NewcombRelated: Newcomb’s planetary observations contributed to nineteenth-century estimates of this fundamental scale.

• Titius–Bode lawRelated: The law expresses its predicted orbital distances in units of this scale.

• Earth’s shadowRelated: Shadow geometry underlies historical methods for estimating the Earth–Sun distance in astronomical units.

• Transit of MercuryRelated: Solar-parallax estimates from transits helped establish the scale represented by this distance.

• 433 ErosRelated: Eros’s close approaches once enabled estimates of the Earth–Sun distance.

• Hills cloudRelated: It provides a familiar scale for comparing the proposed cloud's distance with planetary orbits.

• Interplanetary dust cloudRelated: Dust density and orbital populations are often described by distance from the Sun in AU.

• UY ScutiRelated: UY Scuti’s estimated radius is often compared with the scale of planetary orbits.

• Discovery and exploration of the Solar SystemRelated: Measuring this scale anchored estimates of distances throughout the Solar System.

• SednoidRelated: Sednoid perihelia are measured in astronomical units.