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
