19th century guys looked like that. In 1838 , Bessel became the first to measure stellar parallax . Bessel obtained 0.314 arcseconds for the nearby binary star system 61 Cygni ( No-415,419 ). The modern value for 61 Cygni stellar parallax is 0.286 arcseconds ( FK-A-6 ). Thus, d( 61 Cygni ) =