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Astronominiai matavimo vienetai


SI sistemosšviesapcavastronomijoje










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Šviesmetis




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Žvaigždėlapis, kuriame pavaizduotos žvaigždės, esančios ne toliau nuo Saulės negu 12,5 šviesmečiai.


Šviesmetis (šm, l. y.) – ne SI sistemos ilgio matas, vartojamas ypač dideliems atstumams nusakyti. Šviesmetis apibūdina tokį atstumą, kurį nukeliauja šviesa per vienerius metus, t. y. 9 460 730 472 580, 8 km (apie 9,5 trln. km).


1 šm = 0,3065 pc = 63241 av.


Šviesmetis kaip atstumo matas vartojamas astronomijoje.


Pvz.: Užrašas 5 šm reiškia, kad tai atstumas, kurį šviesa nuskrieja per 5 metus.









Rodomas puslapis "https://lt.wikipedia.org/w/index.php?title=Šviesmetis&oldid=5401939"










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