Lumen Australe Romae Observatum Die 27 Jan. An. 1740. a Didaco de Revillas, Abbate Hieronym. P. Math. Prof. & R. S. S.

Light on the common Classics, to which I have confined this Examination, and which must be my Excuse for the Citations. I am, with great Respect, The Royal Society's and your most obedient humble Servant, E. Latham. XV. *Lumen Australe Romæ observatum die 27 Jan. An. 1740.* a Didaco de Revillas, Abbate Hieronym. P. Math. Prof. & R. S. S. COELO undique nubilo, notoque vehementer flante, hora post Meridiem 6a. rubescens lumen inter gradus 45 & 55 amplitudinis ortivæ australis apparebat. Maxima ejus supra horizontem latitudo gradus circiter 9 æquabat. Parte tamen Coeli horizonti proxima ad unum circiter gradum obtenebrata spatium fere parallelogrammum gradus 10 latum, 8 altum lumini concedebatur; quod in suprema parte magis, minus in ima splendescet. Inter densiores nubes altera summe nigricans *AB* TAB. VI. Fig. 3. horizonti propemodum parallela, supra lumen, meridiem versus protendebatur. Post horæ semissem vividius sensim micabat splendor; sensimque iterum minuebatur: quod pluries usque ad horam 9 observatum. Interim tenuis horizonti zonti itidem parallela nubecula C.D lumen a meridionali plaga intersecans, comparebat. Circa horam 9 nubes aliæ ab orientali versus meridionalem plagam paullatim procedentes splendorem jam languescentem obtegebant: & circa horam 9 ½ penitus extinguebant. Post horam 12 largus imber decidebat. Barometrum toto hoc tempore ad altitudinem pollicum Parisin. 27. 9 ¼ consistebat. Thermometrum mercuriale (quod in aqua ebulliente notat gr. 0.; in nive vero salis communis duabus quintis partibus permixta, gr. 180) designabat tunc temporis gr. 141. Monemus interea lumen hocce nedum splendididius, verum & eminentius visum eodem tempore, & ad eandem plagam ab nonnullis Viterbio ad Urbem accedentibus, ac ab aliis in Via Valeria (hoc est, ad orientem Romæ) quinto supra vicesimum ab eadem urbe millario iter facientibus. --- Corrigenda in Philos. Transactions, No 459. Page 646. Line 12. for 10° 02' 00'' read 10'. 647. Line 7. for Oct. 28. read 27 Oct. 648. Line 9. for 15h 53' 4'' read 15h 55' 4''. --- LONDON: Printed for T. WOODWARD, and C. DAVIS, over-against Gray's Inn-Gate in Holbourn; PRINTERS to the ROYAL SOCIETY. M.DCC.XLIV.