Pagina:Principia newton la.djvu/293

Haec pagina emendata est

Exemplum.

Proponatur Cometa anni 1680. Hujus motum à Flamstedio observatum Tabula sequens exhibet.

Tem. Temp. Long. Long. Lat.
appar. veru Solis Cometæ Cometæ
1680 December 12 4.46 4.46.00 ♑ 1.53.2 ♑ 6.33.0 8.26.0
21 6.32 1/2 6.36.59 11.8.10 ♒ 5.7.38 21.45.30
24 6.12 6.17.52 14.10.49 18.49.10 25.23.24
26 5.14 5.20.44 16.10.38 28.24.6 27.00.57
29 7.55 8.03.2 19.20.56 ♓ 13.11.45 28.10.05
30 8.2 8.10.26 20.22.20 17.37.5 28.11.12
1681 January 5 5.51 6.1.38 26.23.19 ♈ 8.49.10 26.15.26
9 6.49 7.0.53 ♒ 0.29.54 18.43.18 24.12.42
10 5.54 6.6.10 1.28.34 20.40.57 23.44.00
13 6.56 7.8.55 4.34.6 25.59.34 22.17.36
25 7.44 7.58.42 16.45.58 ♉ 9.55.48 17.56.54
30 8.07 8.21.53 21.50.9 ♉ 13.19.36 16.40.57
February 2 6.20 6.34.51 24.47.4 15.13.48 16.02.02
5 6.50 7.4.41 27.49.51 16.59.52 15.27.23

In his observationibus Flamstedius eâ usus est diligentiâ, ut postquam bis observasset distantiam Cometæ à Stella aliqua fixa, deinde etiam distantiam bis ab alia stella fixa, rediret ad stellam priorem & distantiam Cometæ ab eadem iterum observaret, idque bis, ac deinde ex distantiæ illius incremento vel decremento tempori proportionali colligeret distantiam tempore intermedio, quando distantia à stella altera observabatur. Ex hujusmodi observationibus loca Cometæ festinanter computata Flamstedius primò cum amicis communi cavit, & postea easdem ad examen revocatas calculo diligentiore correxit. Nos loca correcta hic descripsimus.

His adde observationes quasdam è nostris.

Temp.
appar. Cometæ Longit. Com. Lat.
Febru. 25 8h.30′ ♉ 26.19′.22′′ 12.46 7/8
27 8.15 27.4.28 12.36
Mart. 1 11.0 27.53.8 12.24 3/4
2 8.0 28.12.29 12.19 1/2
5 11.30 29.20.51 12.2 2/3
9 8.30 ♊ 0.43.2 11.44 3/5

Hæ observationes Telescopio septupedali, & Micrometro filisque in foco Telescopii locatis paractæ sunt: quibus instrumentis & positiones fixarum inter se & positiones Cometæ ad fixas determinavimus. Designet A stellam in sinistro