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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%.

is the furer way~) by the degrees pafs'd in 24. hotirs by a foriner days Obfervation.

You may alfo, inftead of obferving the Suns Rifing and Setting, obferve the Setting nrft, and then next morning the Rifing; markingatbothtimes theTime fhow'd .by the Watches; and find thence, after the famé manner as before, the Longitude of the place where the Ship was at Midnight.

Finally, you may alfo, inftead of the Rinngand Setting of the Sun,ob(erve before and after Noon two equal Altitudes of the Sun, noting the time fhown by the Watches, and reckoning in the fame manner, as hath been faid of the Riung and Setting Yet it is to be conuder'd, that the Altitudes of the Sun are beft taken, when it is about jE~/? and ~?, as hath been already intimated. But note, that in Sailing TVo~ and ~OM/A you make not the Obfervations at the Suns rifing and fetting, but at its being due Eau: and Weft.

9.

But you may, efpecially in fuch Quarters, as lye farr North or .So/A, yea and wherever you will, put the Rule here prefcribed in praélice, by taking s. equal Altitudes of fome known Starr, that rifeth high above the Horizon. For you fhall thence, according to the mention'd Rule, know at what time by the Watches the Starr hath been in the South; and fo the ~<g~of that Starr being known, as alfo the 7~/g~ ~/c~?o~ of the you may thence eafity calculate, what time it then was: Which being compar'd with the time of the Watches, as before, fha!t give the Z.û/;g/w~ of the place where you were, whenyouhad the Starr in the Meridian.

<- 10.

If the Watches, that have gone exactly for a whi!e, fhou!d corne to diHer from one another (as in length of time it may welt happen, that the one or thé other fai!e a minute, more or !efs;) in that café it will be bett to reckon by that, which goes fafteft; unteis you perceive an apparent caufe, why it goes too fait; feeing it is not fo eafie for thete Pendulum-Watches to move fatter than at nrtt, as it is to goe Hower. For, the Wire, on which the 7~w hangs, may perhaps by the violent agitation of the Ship corne to nretch a little, but it cannot grow fhorter; and the little Weight of the P~/M/MW perhaps flip downwards, but cannot get up higher.

11.

When you get fight of any known Country, lïïand or Coatt, be fure to note Œuvres. T. VI. ~8