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Titre : Oeuvres complètes de Christiaan Huygens. Correspondance [de Christiaan Huygens], 1666-1669 / publ. par la Société hollandaise des sciences

Auteur : Huygens, Christiaan (1629-1695). Auteur du texte

Éditeur : M. Nijhoff (La Haye)

Date d'édition : 1888-1950

Contributeur : Koninklijke Hollandsche maatschappij der wetenschappen. Éditeur scientifique

Sujet : Huygens, Christiaan (1629-1695) -- Contribution aux mathématiques

Sujet : Huygens, Christiaan (1629-1695)

Notice d'ensemble : http://catalogue.bnf.fr/ark:/12148/cb38949978f

Type : monographie imprimée

Langue : latin

Langue : français

Langue : néerlandais

Format : 23 vol. : ill. ; 29 cm

Description : Correspondance

Description : Autobiographie

Droits : Consultable en ligne

Droits : Public domain

Identifiant : ark:/12148/bpt6k778547

Source : Bibliothèque nationale de France, département Philosophie, histoire, sciences de l'homme, 4-R-788 (6)

Conservation numérique : Bibliothèque nationale de France

Date de mise en ligne : 15/10/2007

Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour ce document est de 87%.

A.WA W.

the time of the day there to be 5 t8 to And you find the Watch A. to point at. 2 6 o But the Watch B. to poiht at. t 22 Going too How by 7. <ec. every day, which makes in 74. days,

(viz. From the 20 th of 7' to the g th of TtT~y). ô 8 38 Which being added to its own time, gives the fame with that

of the Watch A,Mz. 2 6 o You find alfo the Watch C. to point at. 2 20 ~8 Going 12 fec. too fait every day, which makes in 7~. days.. o t~ ~8 Which being (ubdu~ted from its owne time gives again. 2 6 o Thé time ofday therefore by thé Watches being. 0 2 6 o Adde thereunto the Aequation ofthe 5 th of7!~y. o 10 2(~ And fo you have for the time ofday at the place where the Watchés were (et. 2 25 2o But the time obferv'd being. 5 t8 10 Exceeds thisby. 0 252 4! Wherefore the Meridian of the place, where you are May

~th, is more Eafterly, than the places where the Watches were: fct.. by. 0 0 0 0 2 ~2 4' Which being reduced to degrees, reckoning t degrees for an

deg. m. d.

hour, comes to. 43 to 15

Tis [rue, that from the fame reckoning it may bë concluded, that you are t8o. degrees more Eatterly, which happens, becaufe the Hour-Index goes round in the fpace of 2. hours in the Watches; but the différence is fo great that one cannot be deceiv'd in it; elfe the Watch might be fo made, that the Index fhall goe round but once in 2~ hours.

7.

To find the ~wc o/ D<?y at Sea.

Since that for nnding the Z<w~ the Time of thé day at the place where you are )nuH be known (as hath been faid above) you muit have a care to obferve that time as precilèly as is poffible. For every minute of time, that you mifreckon, makes a ~th part of a degree in longitude, which amounts,near the Aequator, to above !s. Englifh miles, but lets etiewhere. Wherefore to find the time of the day with certainty, you are not to truit to the Obfervation of thé Sun greateft Altitude, thence to conclude that 'tis jutt Noon, or that the Sun is in the South, un!e<s,