Transactions of the Royal Society of Edinburgh . u will fee by the above defcription, appearsto be of the kind called by the learned a Corona j and as itfomewhat refembles the famous one of the fun, obferved atRome in the year 1629, and defcribed by Scheiner*, it defervesthe more attention, efpecially as the great halo, on the prefentoccafion, having its fouth-weftern limb elevated to the heightof 54°, and its north-eaftern depreffed to within 14° of the ho-rizon, was in an oblique position, not eafily reconciled with thetheory of Huygens, which feems to require that fuch circlesfhould be equa
Transactions of the Royal Society of Edinburgh . u will fee by the above defcription, appearsto be of the kind called by the learned a Corona j and as itfomewhat refembles the famous one of the fun, obferved atRome in the year 1629, and defcribed by Scheiner*, it defervesthe more attention, efpecially as the great halo, on the prefentoccafion, having its fouth-weftern limb elevated to the heightof 54°, and its north-eaftern depreffed to within 14° of the ho-rizon, was in an oblique position, not eafily reconciled with thetheory of Huygens, which feems to require that fuch circlesfhould be equally elevated above the horizon all round. It alfofliews, that Scheiners original plan of the halo at Rome,which reprefented it as oblique, may have been right, and thatHuygenss corredlion, which makes it parallel to the horizon,^was probably an erroneous conjecflure. I am, Dear Sir James,^ Your humble fervant, Will,. Hall» * Smiths Optics, voL I. § 534. ¥IU. P/)\ //,,/-r,;,„.,?./?:,/<„/.,„;,//, I,ui:,.://.,„,,,. /^,. /?y/r/z//f /?>/// r/f/?//<? rr-x /^nu/ Imr e y/fryr^// 7t /^f/ ]ii-i w ij-k sliiiT oil llif IHlol F<l,r IJH6 .
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