Imagining an elongated right triangle in space, where the shorter leg measures one au (astronomical unit, the average Earth–Sun distance) and the subtended angle of … See more

Distances less than a parsec
Distances expressed in fractions of a parsec usually involve objects within a single star system. So, for example:
• One astronomical unit (au), the distance from the Sun to the Earth, is just under 5×10 pc. See more

The parsec was used incorrectly as a measurement of time by Han Solo in the first Star Wars film, when he claimed his ship, the See more

• Guidry, Michael. "Astronomical Distance Scales". Astronomy 162: Stars, Galaxies, and Cosmology. University of Tennessee, Knoxville. Archived from the original on 12 December 2012. Retrieved 26 March 2010.
• Merrifield, … See more

The parallax method is the fundamental calibration step for distance determination in astrophysics; however, the accuracy of ground-based See more

To determine the number of stars in the Milky Way, volumes in cubic kiloparsecs (kpc ) are selected in various directions. All the stars in these … See more

• Attoparsec
• Distance measure See more