parsec
/pahr-sek/US // ˈpɑrˌsɛk //UK // (ˈpɑːˌsɛk) //
准星,准星座,准秒,准星数
Definitions
n.名词 noun
- 1
Astronomy.
- : a unit of distance equal to that required to cause aheliocentric parallax of one second of an arc, equivalent to 206,265 times the distance from the earth to the sun, or 3.26 light-years.
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