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Title : Oeuvres complètes de Christiaan Huygens. Correspondance [de Christiaan Huygens], 1666-1669 / publ. par la Société hollandaise des sciences
Author : Huygens, Christiaan (1629-1695)
Publisher : M. Nijhoff (La Haye)
Date of publication : 1888-1950
Contributor : Koninklijke Hollandsche maatschappij der wetenschappen. Éditeur scientifique
Subject : Huygens, Christiaan (1629-1695) -- Correspondance
Subject : Huygens, Christiaan (1629-1695) -- Contribution aux mathématiques
Subject : Huygens, Christiaan (1629-1695) -- Biographies
Type : monographie imprimée
Language : Latin
Format : 23 vol. : ill. ; 29 cm
Format : application/pdf
Copyright : domaine public
Identifier : ark:/12148/bpt6k778547
Source : Bibliothèque nationale de France, département Philosophie, histoire, sciences de l'homme, 4-R-788 (6)
Relation : Notice d'ensemble : http://catalogue.bnf.fr/ark:/12148/cb38949978f
Relation : http://catalogue.bnf.fr/ark:/12148/cb38949978f
Provenance : bnf.fr
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458 CORRESPONDANCE. t66o.
the /
bed. 7'7r/?, thereby to corre~ the ~M-t, after that the Longitude of a place
fhall have been found at divers times to be the fame, fo that you doubt no more
of it. For ail Mapps are very defecûve as to the Scituation of Places in re
of ~? and ~?, chiefly where Seas are interpof'd. ~cû~ to be able always
to know in the profecution of your lourney, how farr you have fail'd from any
place to thejE~/? or ~!?/?. And ifby any notable mifchance or care!e(sne(s att the
Watches fhould come to ftand (HU, yet you may at any place, whereof the
Longitude is certainly known, fet them a going again, and adjuft them there by
the Sun, and fo reckon the Longitudes from that fame Meridian. For, you are
to know, that you are not at ail oblig'd to put one MrM~ Meridian of any knowne
place as a beginning of the Longitude-reckoning; this hapening only in ./Mo~or
Tables o f jLo~g As, when you take for that purpofe the Meridian of the
Pico in 7~A' or that of the Iflands of Corvo and ~YorM (the moft Weiterly
of the ~zo~'M) or any others. Yet it were very fit, that atl Geographers agreed
and pitched upon one and the fame -F/r/? Meridian, that fo atl places might be
known by the fame Degrees as well of Longitude as of Latitude; though in Voy-
aging it is (umcient, to obferve only the différence of Longitudes, beginning to
reckon from the Meridian of any place, you pleafe, as if it were the firfl.
la.
If it happen, that being at Sea att the Watches ftopp, you muft, as fpeedily as
is po(nb!e, fet them a moving again, that you may know, how much you advance
from that place towards the jE~/? or ~c/7: Which is of no finall importance,
fince for want of this knowledge, you are fometimes by the force of Curret1ts fo
carried away, that though you faile before the ~?/ yet you are driven a Stern,
of which there are many Examples.
i3.
The M~/M~o/' ybM~M//b~ the ~?/cAey.
The Watches being diningnitt by marks as A. B. or the like, every day about
Noon, or when mott conveniently you can, obferve the time of the day by the
Sun or by the ~~Ty at night,andfubdu6tthence the w/MM~and/cco~, that
are adjoynM to that day in the Table, and write the rcmainder down in a paper,
wherein o. Co/ww or more are mark't, placing them in the~co/ cotumn, having
plac'd thé day of thé ~7
hours, minutes and féconds of each Watch in a dinin~co!umn,aUoppouteone
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