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The nearer stars are measured by triangulation using the radius of the Earth's orbit as the basic yardstick.
Friedrich Bessel discovered parallax in 1838, the slight movement of a star against the background of more distant stars caused when the Earth orbits around the Sun. He picked out a star that he suspected was close, called 61 Cygni, and found that it was at a distance of ten light-years.
This method is used for stars out to about 200-300 light years.
Wiki User
∙ 8y ago
Wiki User
∙ 16y agolight years, parsec, Astronomical Unit( AU)
Wiki User
∙ 8y agoThe parallax method is used for nearby stars. For stars that are further away, there are a variety of methods; check the Wikipedia article for "Cosmic distance ladder" for more details.
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