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

William Henry Smyth

doi:10.1017/CBO9780511659003

Admiral William Henry Smyth's Sidereal Chromatics (1864) represents a landmark achievement in nineteenth-century astronomy, offering the most precise observations of the colours of double stars yet recorded. An expansion upon his well-known Bedford Cycle of Celestial Objects, which garnered a gold medal from the Royal Astronomical Society, Sidereal Chromatics provides both a theory concerning the source of double-star colours and a method for determining their most exact description. Detailed charts compare Smyth's measurements of more than one hundred double stars with his own previously published observations and those of his fellow astronomer, Father Benedetto Sestini. This edition also includes Smyth's famous colour chart, an attempt to standardise the process of identifying double-star colours. Sidereal Chromatics ends with Smyth's plea to amateur astronomers to continue the effort of charting the heavens, aided by improved telescopes and works such as his, 'trustworthy treatises available to all men'.

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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

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Contents

Frontmatter
pp i-iv

TO JOHN LEE, ESQ., Q.C., LL.D., F.R.S., F.S.A., F.R.A.S., F.G.S., &c.
pp v-x

Contents
pp xi-xii

PART I - A re-print, with additions, of the remarks on the Colours of Double Stars contained in the third chapter of the CYCLE OF CELESTIAL OBJECTS, under the title of “A Glance at the Sidereal Heavens.”
pp 13-21

PART II - The Colours of Double Stars continued: being a re-print of the seventh chapter of the SPECULUM HARTWELLIANUM, with additions, and a proposed Diagram of Colours
pp 22-74

APPENDIX
pp 75-76

I - The instance of the Double Star 95 Herculis, and its marked Variations in colour completely proved
pp 77-81

II - The Colours of Double Stars as affected by the anomalies of rays arising from the tremors—and other effects—of the atmosphere
pp 82-85

Postscript
pp 86-90

INDEX
pp 91-96

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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

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