Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                <p type="main">
                  <s>
                    <pb xlink:href="039/01/496.jpg" pagenum="465"/>
                  liptico circum Solem movebatur, ſpatio annorum pluſquam quin­</s>
                </p>
                <p type="main">
                  <s>
                    <arrow.to.target n="note494"/>
                  gentorum, quantum ex erroribus illis judicare licuit, revolutio­
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                  nem peragens. </s>
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                <p type="margin">
                  <s>
                    <margin.target id="note494"/>
                  LIBER
                    <lb/>
                  TERTIUS.</s>
                </p>
                <p type="main">
                  <s>Cæterum Trajectoriam quam Cometa deſcripſit, & Caudam
                    <lb/>
                  veram quam ſingulis in locis projecit, viſum eſt annexo ſchemate
                    <lb/>
                  in plano Trajectoriæ optice delineatas exhibere: Obſervationibus
                    <lb/>
                  ſequentibus in Cauda definienda adhibitis. </s>
                </p>
                <p type="main">
                  <s>
                    <emph type="italics"/>
                  Nov.
                    <emph.end type="italics"/>
                  17 Cauda gradus amplius quindecim longa
                    <emph type="italics"/>
                  Ponthæo
                    <emph.end type="italics"/>
                  ap­
                    <lb/>
                  paruit.
                    <emph type="italics"/>
                  Nov.
                    <emph.end type="italics"/>
                  18 Cauda 30
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  longa, SoliQ.E.D.recte oppoſita in
                    <lb/>
                    <emph type="italics"/>
                  Nova-Anglia
                    <emph.end type="italics"/>
                  cernebatur, & protendebatur uſque ad ſtellam ,
                    <lb/>
                  quæ tunc erat in 9
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  54′.
                    <emph type="italics"/>
                  Nov.
                    <emph.end type="italics"/>
                  19 in
                    <emph type="italics"/>
                  Mary-Land
                    <emph.end type="italics"/>
                  cauda viſa
                    <lb/>
                  fuit gradus 15 vel 20 longa.
                    <emph type="italics"/>
                  Dec.
                    <emph.end type="italics"/>
                  10 Cauda (obſervante
                    <emph type="italics"/>
                  Flamſtedio
                    <emph.end type="italics"/>
                  )
                    <lb/>
                  tranſibat per medium diſtantiæ inter caudam ſerpentis Ophiuchi &
                    <lb/>
                  ſtellam
                    <foreign lang="grc">δ</foreign>
                  in Aquilæ auſtrali ala, & deſinebat prope ſtellas
                    <emph type="italics"/>
                  A,
                    <foreign lang="grc">ω</foreign>
                  , b
                    <emph.end type="italics"/>
                  in
                    <lb/>
                  Tabulis
                    <emph type="italics"/>
                  Bayeri.
                    <emph.end type="italics"/>
                  Terminus igitur erat in
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  19 1/2
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  cum latitudine
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                  boreali 34 1/4
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  circiter.
                    <emph type="italics"/>
                  Dec.
                    <emph.end type="italics"/>
                  11 ſurgebat ad uſque caput Sagittæ
                    <lb/>
                  (
                    <emph type="italics"/>
                  Bayero,
                    <emph.end type="italics"/>
                    <foreign lang="grc">α, β</foreign>
                  ,) deſinens in
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  26
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  43′, cum latitudine boreali
                    <lb/>
                  38
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  34′.
                    <emph type="italics"/>
                  Dec.
                    <emph.end type="italics"/>
                  13 tranſibat per medium Sagittæ, nec longe ultra
                    <lb/>
                  protendebatur, deſinens in=4
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  , cum latitudine boreali 42 1/2
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  circi­
                    <lb/>
                  ter. </s>
                  <s>Intelligenda ſunt hæc de longitudine caudæ clarioris. </s>
                  <s>Nam luce
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                  obſcuriore, in cœlo forſan magis ſereno, cauda
                    <emph type="italics"/>
                  Dec.
                    <emph.end type="italics"/>
                  12, hora 5, 40′
                    <lb/>
                    <emph type="italics"/>
                  Romæ
                    <emph.end type="italics"/>
                  (obſervante
                    <emph type="italics"/>
                  Ponthæo
                    <emph.end type="italics"/>
                  ) ſupra Cygni Uropygium ad gradus 10
                    <lb/>
                  ſeſe extulit; atque ab hac ſtella ejus latus ad occaſum & boream
                    <lb/>
                  min. </s>
                  <s>45 deſtitit. </s>
                  <s>Lata autem erat cauda his diebus gradus 3, juxta
                    <lb/>
                  terminum ſuperiorem, ideoque medium ejus diſtabat a Stella illa
                    <lb/>
                  2
                    <emph type="sup"/>
                  gr
                    <emph.end type="sup"/>
                  15′ auſtrum verſus, & terminus ſuperior erat in
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  22
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  cum
                    <lb/>
                  latitudine boreali 61
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  .
                    <emph type="italics"/>
                  Dec.
                    <emph.end type="italics"/>
                  21 ſurgebat fere ad cathedram
                    <emph type="italics"/>
                  Caſſio­
                    <lb/>
                  peiæ,
                    <emph.end type="italics"/>
                  æqualiter diſtans a
                    <foreign lang="grc">β</foreign>
                  &
                    <emph type="italics"/>
                  Schedir,
                    <emph.end type="italics"/>
                  & diſtantiam ab utraque
                    <lb/>
                  diſtantiæ earum ab invicem æqualem habens, adeoQ.E.D.ſinens
                    <lb/>
                  in
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  24
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  cum latitudine 47 1/2
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  .
                    <emph type="italics"/>
                  Dec.
                    <emph.end type="italics"/>
                  29 tangebat
                    <emph type="italics"/>
                  Scheat
                    <emph.end type="italics"/>
                  ſitam ad
                    <lb/>
                  ſiniſtram, & intervallum ſtellarum duarum in pede boreali
                    <emph type="italics"/>
                  Andro­
                    <lb/>
                  medæ
                    <emph.end type="italics"/>
                  accurate complebat, & longa erat 54
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  adeoQ.E.D.ſinebat
                    <lb/>
                  in 8 19
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  cum latitudine 35
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  .
                    <emph type="italics"/>
                  Jan.
                    <emph.end type="italics"/>
                  5 tetigit ſtellam
                    <foreign lang="grc">π</foreign>
                  in pectore
                    <lb/>
                    <emph type="italics"/>
                  Andromedæ,
                    <emph.end type="italics"/>
                  ad latus ſuum dextrum, & ſtellam
                    <foreign lang="grc">μ</foreign>
                  in ejus cingulo
                    <lb/>
                  ad latus ſiniſtrum; & (juxta Obſervationes noſtras) longa erat
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                  40
                    <emph type="sup"/>
                  gr.
                    <emph.end type="sup"/>
                  ; curva autem erat & convexo latere ſpectabat ad auſtrum. </s>
                  <s>
                    <lb/>
                  Cum circulo per Solem & caput Cometæ tranſeunte angulum
                    <lb/>
                  confecit graduum 4 juxta caput Cometæ; at juxta terminum al­
                    <lb/>
                  terum inclinabatur ad circulum illum in angulo 10 vel 11 graduum,
                    <lb/>
                  & chorda caudæ cum circulo illo continebat angulum graduum </s>
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