Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. -
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- A P
- Node ot che Moon; and whenthe Moon also is ) char some Parallax Bould be found: And chis
- to be Northerly in one Pode, and Southerly in ould be a Discorerr oE grear Moment, il it
- the ocher: In chese chings there necds no sreat
- Exactness, because the Ditterences oF Lacitude
- may be susticienty supplied trom he Pables.
- AEthese Times ot Observation let ehe visibl
- Ptaces ot the Moon boch in Lonsirude ane
- Laciiude be caken, rosether ith her risible AI-
- rirudes and Diameters, wrhich ler bereduced 10
- rhe FTorizontal; then From the Pimes and Vis-
- ble Places, let in cach Obserration, the Verrical
- Ansle be. compured, wrhich is made wich the
- Circle oE Laricude at the Moons Cenrre; and
- chen che Disserence by irtrich the Souchem Laci-
- cude excecdsthe Norrhern (in our Norchern pari
- OF che WVorId) is the Sum oF che Parallaxes ot
- Laricude, wrhich, must be dirided into LNO ParES
- Wvhich t0 do, pur into one sum che Losarichms
- OF the Sine oF the Lorizoncal Semi-diametex ol
- the risible Distance of che Moon trom che Ver
- cex, and of che Complement oE the Ansle oF the
- Vertical Circle, wich che Cirele os Larirude, in
- each Oblerrarion.
- Then out oE the greater Sum cake the lesser
- and ro che Difference add FRadius, theSum Mal
- bc ihe Losaritim ot ihe Tangent oF an Ark
- From Whence rake 45 Degrees; then will ic be a5
- Radiusto the Tangent of cheRemainins ArK:
- 50 is the Tansent oF che half Sum ot che Parat.
- lay, r0 the Tangent oF half their Disterence:
- Bucche half sum and halt Disserence rosether, id
- the greater Parallax oF Laritude, and the Disse
- rence betreen them is the lesser. Patre chis
- Parallax ol Latitude out of che visible Souchern
- Paticude; or add it rothe Northern, and il
- vill Mev che Inclination.
- An Cen Lat, I WDe as ie Rectansle
- under the sines of che Distance seen trom the
- Cenith, and ot the Complemene ot the Angle 0
- he Verricle Cirele wich che Circle ot Laricude, i
- tothe Square ot che Radius:: S0 is the Sinc o
- che Parallax oC Larirude, r0 che Sine oE cheL
- rizontal Parallax.
- Andthere is berrveen the Sine OF ThC LLOTIZON-
- ral Senameter oF etie NOOn, a LIIC LLOLL
- Zontal Parallax, lO Conlanc a Proporrion, chac if il
- could be made; because it ovld be an undoub-
- ced Demonstration For the Annual Motion oFche
- Farth round che Sun, it any such Parallax consd
- be discorered.
- This theIngenious Dr. FTook attempred ro finc
- by obserrins che various Distance ot a Fix d
- Scar Cromthe Zenith: (Sec a Dissertation ot his
- designedy rrircen oi this Subject.) And our
- Excellent AAtronOmet ME. Flamsteed, actually dic
- obserre ic by the Accels and Recels oF a Fix d
- s
- Sear co ind from the Pole oF the Rquator ac dit-
- Terent Pimes oF ehe Year.
- And he alsures us, in his Letter eO DF. WV allis
- Written Decemb. 20. 1698. and Publimed in the
- Larin Fdirion Ot DF. Walliss Works: Thacha
- Found the Distance oF a Fix d Star near che
- Pole oF etie Worid 10 bc 40 Seconds, Or 43
- Seconds nearer ro it ac the Winter Solsice cham
- at the summer one: And this he obferred For 7
- Tears rogecher wich sreat ACCMTACY.
- So chac he judges che Objection oF RiocioluS
- against che Farchs Morion ro be entirely remo
- ved, and its Revolution round the Sun prO.
- red.
- Dr. Gregory seems not Patissied with chis Proot
- (tho hebelieres the Doctrine trom orher Princi-
- Ples) buc inclines rather to che Opinion OF C0.
- pernicui, Thac che Diameter oF the ParrtS AnnuI
- al Orbit is insensible, in respect ot the Distance
- OF the Fix d STarS. BuE Others may judge whe-
- cher he brinss Reasons Cufficient to overchron
- Obserrations (o caretuiIr, and (oofren made, a5
- those produced by MP. Flamsteed Sec tis Astron
- P. 275, 276.
- PARALLAX os Faricude, is an Arch oE
- Sreac Circle passins by ihie Poles oF the Zodiack
- to the apparent Place of ihe Scar, and interceprec
- berreen tro Circles ot the Ficliprick equally di-
- Rane, Whereot the one passerh by the rrue Place
- OF che Scar, and the ocher by che APParenE
- Place.
- PARALLAZOs Congitude, is an Arch oF che
- Eeliprick (or Parallel Thereto) intercepted be-
- tveen uvo great Circles, Whereot the ore pal
- sechtrom etie Poles ofthe Feliprick, and the erne
- Place; the orher From the (aid Poles By che ap-
- Parent Place: S0 that the Parallax oF Longicude
- is onty che Difterence ot the rrue and apparent
- Place, accordins ro ine Lonsimde ot the Eclip-
- tick.
- PARALLAOETCAT Anele, is an Angle made
- by the Oblique curring ot a Circle oF Altirude,
- findir, see Ansle os the Felipriek with the Verticat
- Circle
- PARALLEL Linos in Geometry, are chole
- which run alvars equi distant trom cach orher;
- on d neirher 50 Further From, nor come neareK
- tocach otter; and cheir Distance is alW2YSmea-
- sured by a Perpendicular, Wrhich whererer it be
- caten, is oE che same lensih, or is stvare
- equat 10 ir setF.
- eanbe buconceknown, che Moons Parallax at
- any time ill be had trom che Obserration oF her
- Diamerer.
- AII the Dissiculer ot this Procels, is in oblet
- VINZ LHC MIIIOIC Laritudes OF the MOOn; and
- erhich indeed cannor De had without che help Ot
- the Fix a StarS, Whose Laritudes are in no lata.
- IOSuC yCE exFanE, Correct to a Minute: THerC
- Fore elle Accurare Solution of this Problem muit
- depend on fome berrer Pables than are yet puo
- lishred. And those L hope we mas expect trom or Verrical Circle wirh the Fctiprick. FIoW l
- the melc securare Altronomer, MI. Llunslced
- Whiest hie hrach finim dhis Cacalogue ottLLA
- Scars, Wrhich he is nou about.
- In che Ingenious Dr. Crecoris Astronomia
- very uletul rarieer of Propolitions For the find
- ine che Parallax, Vide LIb. 2. Sect. 7.
- Tho there be no Parallax oF rhe Fix d StaIS,
- in respect. of the Farchs Cemi-diamerer, the wotrole
- Body oF che Farth beins bur a Point in reterence
- roche Distance Berrveen us and the Fix d STars;
- ec in respeet oF che Annual Orbir of che Farrh.
- Physica and Geometrica, rou have 2 great and (o thac is ther vere intinitelr produced, ther
- it nads qbds veea cnte
Cite
Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. - . Machine transcription, not an edition: Leibniz Legible (model FoNDUE-GD_v2_ft_Leibniz, run 74). https://leibnizlegible.com/page/806933011:0600?run=74