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<title>Observations of the sun and moon at the spring equinox</title>
<author xml:id="in"><persName key="nameid_1" sort="Newton, Isaac" ref="nameid_1" xml:base="http://www.newtonproject.sussex.ac.uk/catalogue/xml/persNames.xml">Isaac Newton</persName></author>

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<extent><hi rend="italic">c.</hi> <num n="word_count" value="237">237</num> words</extent>

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<authority>The Newton Project</authority>
<pubPlace>Falmer</pubPlace>
<date>2014</date>
<publisher>Newton Project, University of Sussex</publisher>
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<note type="metadataLine"><hi rend="italic">c.</hi> early 1701, in Latin, <hi rend="italic">c.</hi> 381 words, 1 p.</note>
<note n="pages">1 p.</note>
<note n="language">
<p>in Latin</p>
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<idno n="EL-N1-63">EL/N1/63</idno>
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<origDate when="1701-05-28"><hi rend="italic">c.</hi> early 1701</origDate>
<origPlace>England</origPlace>
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<language ident="lat">Latin</language>
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<change when="2014-02-19">Transcription by <name>Daniele Cassisa</name></change>
<change when="2014-06-16" status="released">Code audited by <name xml:id="mjh">Michael Hawkins</name></change>
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<pb xml:id="p063r" n="63r" facs="#i81"/><fw type="shelfmark" place="topLeft" hand="#unknown2"><hi rend="large"><hi rend="bold">63</hi></hi></fw><fw type="shelfmark" place="topLeft" hand="#unknown1">Newton 23</fw><fw type="shelfmark" place="topCenter" hand="#unknown1">63</fw>
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<p xml:id="par1">2 Copies.</p>
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<ab type="head" rend="center" xml:id="hd1">Elementa motuum Solis et Lunæ <lb type="intentional" xml:id="l1"/>ab Æquinoctio verno.</ab>
<p xml:id="par2">Tempus æquabile, quod verum dici solet, diurnæ non solis <lb xml:id="l2"/>sed Fixarum revolutioni proportionale est et inde condendæ sunt <lb xml:id="l3"/>Tabulæ pro æquatione Temporis.</p>
<p xml:id="par3">In Obser<del type="over"><gap reason="illgblDel" unit="chars" extent="1"/></del><add place="over" indicator="no">v</add>atorio Regio Grenovicensi, Anno Christi 1701 ineunt <lb xml:id="l4"/>ad meridiem <choice><abbr>Kal.</abbr><expan>Kalendarum</expan></choice> <choice><abbr>Ian.</abbr><expan>Ianuarij</expan></choice> stylo veteri, erit medius motus Solis <lb xml:id="l5"/>9<hi rend="superscript">s</hi>.21<hi rend="superscript">gr</hi>.42′.38″ Apogæi ejus 3<hi rend="superscript">s</hi>.07<hi rend="superscript">gr</hi>.44′.30″, Lunæ 10<hi rend="superscript">s</hi>.28<hi rend="superscript">gr</hi>.30′.12″ &amp; <lb xml:id="l6"/>Apogæi ejus 11<hi rend="superscript">s</hi>.08<hi rend="superscript">gr</hi>.25′.14″.</p>
<p xml:id="par4">Uraniburgum est orientalius Observatorio Regio Parisiensi <lb xml:id="l7"/>00<hi rend="superscript">h</hi>.42′.10″ &amp; hoc Observat<del type="over"><gap reason="blotDel" unit="chars" extent="1"/></del><add place="over" indicator="no">o</add>rium est orientalis Grenovicensi <lb xml:id="l8"/>00<hi rend="superscript">h</hi>.09′.15″, et inde per reductionem habentur motus illi medij <lb xml:id="l9"/>eodem die et hora ad meridianum Uraniburgi, viz<hi rend="superscript">t</hi> Solis 9<hi rend="superscript">s</hi>.21<hi rend="superscript">gr</hi>.40′.32″ <lb xml:id="l10"/>Apogæi ejus 3<hi rend="superscript">s</hi>.07<hi rend="superscript">gr</hi>.44′.30″ Lunæ 10<hi rend="superscript">s</hi>.28<hi rend="superscript">gr</hi>.01′.58″ &amp; Apogæi ejus <lb xml:id="l11"/>11<hi rend="superscript">s</hi>.8<hi rend="superscript">gr</hi>.25′.00″. Et ante undecim dies seu meridie <choice><abbr>Kal.</abbr><expan>Kalendarum</expan></choice> <choice><abbr>Ian.</abbr><expan>Ianuarij</expan></choice> <lb xml:id="l12"/>stylo novo erit motus medius Solis 9<hi rend="superscript">s</hi>.11<hi rend="superscript">gr</hi>.50′.00″ Apogæi ejus <lb xml:id="l13"/>3<hi rend="superscript">s</hi>.7<hi rend="superscript">gr</hi>.44′.32″, Lunæ 6<hi rend="superscript">s</hi>.03<hi rend="superscript">gr</hi>.05′.33″ &amp; Apogæi ejus 11<hi rend="superscript">s</hi>.07<hi rend="superscript">gr</hi>.11′.28″<supplied reason="omitted">.</supplied></p>
<p xml:id="par5">Maxima Solis Prostaphæresis quæ Keplero est plusquam <lb xml:id="l14"/>2<hi rend="superscript">gr</hi>.3′ debet esse tantum 1<hi rend="superscript">gr</hi>.56′.20″.</p>
<p xml:id="par6">Ubi hæc æquatio additur vel subducitur medio motui Solis <lb xml:id="l15"/>debet ejus pars decima e contra subduci vel addi medio motui <lb xml:id="l16"/>Lunæ. Nam medius motus <del type="cancelled">Solis</del> Lunæ non est uniformis sed per <lb xml:id="l17"/>vices tardescit et acceleratur propterea quod Orbis Lunæ dilatatur <lb xml:id="l18"/>in perigæo Solis et contrahitur in ejus Apogæo.</p>
<p xml:id="par7">Postquam motus medius Lunæ sic correctus habetur, <lb xml:id="l19"/>reliqua peragenda sunt per Tabulas Kepleri: et Æquinoctium <lb xml:id="l20"/>vernum incidet semper in diem horam et minutum ubi longitu<lb xml:id="l21"/>do Solis per hoc computum prodit 00<hi rend="superscript">s</hi>.00<hi rend="superscript">gr</hi>.00′.00″<supplied reason="omitted">.</supplied></p>
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<p xml:id="par8">N<hi rend="small">o</hi>. 40</p>
<p xml:id="par9"><choice><abbr>S<hi rend="superscript">r</hi></abbr><expan>Sir</expan></choice> Isaac Newton.</p>
<p rend="indent0" xml:id="par10">Elementa motuum Solis et <lb type="intentional" xml:id="l22"/>Lunæ ab Æquinoctio Verno.</p>
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