Sidereal Chromatics

Being a Re-Print, with Additions from the Bedford Cycle of Celestial Objects and its Hartwell Continuation on the Colours of Multiple Stars

af William Henry Smyth

A major achievement of nineteenth-century astronomy, Admiral William Henry Smyth's Sidereal Chromatics (1864) presented the most precise analysis of the colours of double stars yet recorded. Detailed observations by Smyth and a range of correspondents, together with his famous colour chart, make this a landmark work of amateur astronomy.