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which is the first binary star system discovered ever?
Xi Ursae Majoris (Xi UMa, ξ Ursae Majoris, ξ UMa) is a star system in the constellation Ursa Major. On May 2, 1780, Sir William Herschel discovered that this was a binary star system, making it the first such system ever discovered.
but there are ancient records that people identified some stars to be binary....even before gravity was discovered.
but there are ancient records that people identified some stars to be binary....even before gravity was discovered.
from ancient times it is known in indian astronomy that two stars mizar and alcor is a binary system in big dipper asterism.
it is probably the most ancient and first of its kind discovered in sky by early astronomers
I dont know the answer, i suggested alcor and mizar because it was observed before william herschel discovered other binaries.I think they were first visual binaries ever discovered.
But there proper motion was also studied by ancient indians.
It's likely that any reference to them moving around each other is based on something other than visual observation.