203463l

Les deux réformateurs de l’analyse spectrale

Un peu avant les désastres de la guerre franco-allemande, l’Académie des sciences de Paris dècernait solennellement à MM. Janssens et Norman Lockyer une médaille d’or frappée en l’honneur d0’une grande découverte que ces deux astronomes avaient faite simultanément. En effet, le premier dans l’Inde, le second dans les bureaux du

Leggi
oldcme

La chimica celeste: una nuova scienza

Una nuova scienza LA CHIMICA CELESTE. Siamo certi di fare cosa grata ai nostri lettori pubblicando per primi in Italia questo importante discorso che l’illustre scienziato J. Janssen lesse testè all’Accademia francese. L’astronomia, attraversa in questo momento un epoca ben interessante, ma abbastanza singolare. Finora questa scienza era stata esclusivamente

Leggi
padova_scheda_5b

L’association spectroscopique Italienne

ANALYSE SPECTRALE L’association spectroscopique Italienne, par M. H. TARRY. – Le spectroscope est incontestablement le seul instrument capable d’enrichir la science de nouvelles découvertes sur la constitution physique du soleil. A Rome, le père Secchi, directeur de l’Observatoire du collége romain, et M. Respighi, directeur de celui du Capitole, furent

Leggi
scheda_6

Analyses spectrales et observations des protubérances solaires

Le P. Secchi a publié, en 1868, dans les Actes de la Société italienne des Quarante, deux mémoires importants, accompagnés de planches, sur les spectres prismatiques des étoiles fixes. Divers observateurs se sont occupés aussi des lignes spectrales qu’on peut distinguer dans les aurores boréales. On doit citer encore les

Leggi
CoronaSolarWillard-Brothers

Éclipse de Soleil de 1870

L’éclipse de soleil du 22 décembre 1870 a pu être observée en bonne partie à Greenwich, et la réduction des observations a prouvé que les erreurs des tables de la lune de Hansen étaient petites, et sensiblement les mêmes près de la conjonction que dans les autres parties de l’orbite

Leggi
nuevacatania2

Mr. Lockyer on the Eclipse

Mr. Lockyer, the English astronomer, in speaking of the eclipse, says: Cloud in Sicily, cloud in Spain, cloud in Africa. Such, at first sight, might seem to be the only result of all the observations made on the eclipsed sun of 1870; such the reception given by Nature to those

Leggi
expedition_every_saturday

The eclipse

The reader will find three pictures on page 156 illustrating the eclipse which excited so great interest in the scientific world and which has added so little to our previous knowledge of the phenomenon. The first cut represents the eclipse as seen from Xeres by the American expedition. The other

Leggi
eclipse_gibraltar

The eclipse at Gibraltar.

  Men of science hoped at the Eclipse of 1870 to determine the nature of the corona, including beams and streamers; but the clearest possible sky was indispensable for the roper use of so delicate an instrument as the polariscope, and this condition was not accorded at Gibraltar even for

Leggi
eclisse_roscoe_1

The eclipse of December, 22nd, 1870

The eclipse of December, 22nd, 1870. By Professor Roscoe, F.R.S. It is satisfactory to know that in spite of the worst Possible weather, as well as of misfortunes and losses of Various kinds which fell to the lot of the English and American savants who went to Africa, Spain, and

Leggi
eclipse_sun_partA

The Eclipse of the sun.

The accounts of some of the astronomical observers, on the 22nd ult., at Gibraltar, Cadiz, Seville, and Oran, on the African coast, where the eclipse was total, were briefly noticed in our last. We are indebted to Captain T. R. Lethbridge, commanding H.M.S. Trafalgar, and to Mr. Eaton Wallace Petley,

Leggi