A cikin 1834, Friedrich Bessel ya lura da canje-canje a cikin motsi na tauraron Sirius kuma ya haifar da wani aboki mai ɓoye. Edward Pickering ya gano na farko na binary binary a 1899 lokacin da ya lura da rabuwa na lokaci-lokaci na layi na Mizar a cikin kwanaki 104. Masana kimiyya kamar Georg Friedrich Wilhelm von Struve da S. W. Burnham sun tattara cikakken lura da tsarin tauraron tauraron da yawa, suna ba da damar ƙayyade tauraron tauraron daga ƙididdigar tauraron Sirius.
Shekaru 1834