© Norman Sperling, December 26, 2012
Part of a set on the Voynich Manuscript:
Great Stories from a Book You Can't Read: The Voynich Manuscript December 23, 2012
Voynich: Turkish? December 24, 2012
Voynich: 2 or More Handwritings? December 25, 2012
Could 2 of Voynich's Oddities Cancel Each Other Out? December 27, 2012
Did Voynich Swindle Mondragone? December 28, 2012
Would You Like to Buy a Copy of the Voynich Manuscript? December 29, 2012
William R. Newbold's 1921 contention that the spiral graphic in folio 68r represents a spiral nebula is wild bunk. The spiral nebula concept was suggested to Newbold by astronomer Eric Doolittle, who really should have known much better. Doolittle was a diligent and much-appreciated expert on double stars, but at f/20 his telescope gave some of the poorest, faintest, least-contrasty views of nebulae (the category from which galaxies had not yet been separated). To be blunt, Doolittle was out of his specialty and didn't know what he was talking about.
While the Great Galaxy in Andromeda is visible to the naked eye as an oval smudge, it does not look spiral through even today's visual telescopes. It doesn't even appear face-on, but is strongly tilted to our view. It was first recognized as a spiral in 1899, by pioneering astrophotographer Isaac Roberts: "[the object is] a left-handed spiral, and not annular as I at first suspected". Photographs of Stars II, p63. Newbold's own book says as much (William Romaine Newbold, edited by Roland Grubb Kent: The Cipher of Roger Bacon, University of Pennsylvania Press, 1928, Chapter XI, p 123).
The very first time any celestial object was recognized as a spiral was 1843, using the world's then-largest telescope, Lord Rosse's new 72-inch-wide "Leviathan of Parsonstown". Even with highly improved telescopes in the 2010s, visual observers are hard-put to distinguish spirality in the highest-contrast, most-vivid spiral - the Whirlpool galaxy in Canes Venatici, M51 - with any telescope narrower than 12 inches. Even then, the focal ratio must be f/8 or less to concentrate light enough. Early-1600s telescopes by Lippershey, Galileo, and others were less than 2 inches wide, and typically f/20-f/40, with notoriously imperfect lenses that smeared light around. For a deeper explanation of focal ratio and surface-brightness, read my essay Of Pupils & Brightness. NO primitive telescope of the Renaissance, let alone some speculated pioneer of the Middle Ages, had the slightest chance of revealing spirality in any object, to any observer, under any conditions.
Newbold speculated about the changes a nebula might show over the 650 years from Roger Bacon's time to his own. We now know that the spirals are galaxies, so wide that light takes tens of thousands to hundreds of thousands of years to traverse them. The sharpest photographs of the last century have not revealed any measurable rotation. The only changes are sudden appearances of supernovae, which fade back down. The spiral in 68r is NOT a galaxy.