≡ 5280 US Survey feet ≡ ( 5280 × 1200⁄ 3937) mĭistant point with a parallax shift of one arc second from a base of one astronomical unit. ≈ 1⁄ 10 000 000 of the distance from equator to pole. ≡ Distance light travels in 1⁄ 299 792 458 of a second in vacuum. ≡ Distance light travels in vacuum in 365.25 days ≡ Distance light travels in one second in vacuum ≈ 1 hour walk, Currently defined in US as 3 Statute miles, but historically varied from 2 to 9 km One km/s is about a parsec in 106 yr so a 0.1 km/s perturbation in a i09 yr old cluster. Legally defined as 1.033 English feet in 1859 The velocity dispersions u (U, W), are 15 kmls at 4 giga years. = 1⁄ 3in (see note above about rounding) Indicates that digits repeat infinitely (e.g. Within each table, the units are listed alphabetically, and the SI units (base or derived) are highlighted. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre). Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. For each physical quantity, a number of different units (some only of historical interest) are shown and expressed in terms of the corresponding SI unit. It is exactly 648,000/ astronomical units, or approximately 30.9 trillion kilometers. A parsec is a unit of distance used in astronomy. This article gives lists of conversion factors for each of a number of physical quantities, which are listed in the index. How many light years are in a parsec Easy pc to light years conversion.
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