Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1Virginis & cum Lance auſtrali Libræ, & hæc linea ſecat viam
Cometæ in 18gr. 36′. Ponthæusetiam eodem tempore obſer­
vavit, quod Cometa erat in recta tranſeunte per Chelam auſtri
nam Scorpii & per ſtellam quæ Lancem borealem ſequitur: &
hæc recta ſecat viam Cometæ in 16gr. 34′. Obſervavit etiam,
quod Cometa erat in recta tranſeunte per ſtellam ſupra Lancem
auſtralem Libræ & ſtellam in principio pedis ſecundi Scorpii: &
hæc recta ſecat viam Cometæ in 17gr. 55′. Et inter longitu­
dines ex his tribus Obſervationibus ſic derivatas, longitudo me­
diocris eſt 17gr. 42′, quæ cum obſervatione Montenariſatis
congruit.
LIBER
TERTIUS.
Erravit igitur Celliusjam locando Cometam in 15gr. 47′,
per ejus Azimuthum & Altitudinem.
Et ſimilibus Azimuthorum
& Altitudinum obſervationibus, Cellius& Ponthæusnon minus
erraverunt locando Cometam in 20 & 24 diebus duobus
ſequentibus, ubi ſtellæ fixæ ob diluculum vix aut ne vix quidem
apparuere.
Et corrigendæ ſunt hæ obſervationes per additionem
duorum graduum, vel duorum cum ſemiſſe.
Ex omnibus autem Obſervationibus inter ſe collatis & ad meri­
dianum Londinireductis, colligo Cometam hujuſmodi curſum
quamproxime deſcripſiſſe.
Temp. med. ſt. vet.Long. CometæLat. Cometæd.h.′gr.′gr.′Nov.15.17.10 8.00.44Auſt.17.17.1012.521.01821.4418.401.181917.1022.482.3020.17fere27.521.4822.17fere 2.561.3827.17 1/4ſere12.582.2024.17 1/2ſere17.532.2326.18.0026 vel 27gr.2.42
Loca autem Cometæ in Orbe Parabolice computata, ita ſe habent.

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