An Extract of a Letter from Mr. J. Flamsteed Astr. Reg. and Reg. Soc. S. Giving His Calculation of the Eclipses of Jupiters Satellites for the Year 1687. Together with a Table of the Parallaxes of the Orb, and the Ephemeris of Jupiters Geocentric Place for the Same Year; To which is Added An Observation of the Eclipse of the Moon Novemb. 30, 1695. Made at Lisbon, and Mr. Flamsteed's Own Observation of the Eclipse of Jupiter by the Moon on March 31th. Past

An Extract of a Letter from Mr. J. Flamsteed Astr. Reg. and Reg. Soc. S. giving his calculation of the Eclipses of Jupiter's Satellites for the Year 1687. Together with a Table of the Parallaxes of the Orb, and the Ephemeris of Jupiter's Geocentric Place for the same Year; to which is added an Observation of the Eclipse of the Moon, Novemb. 30, 1695. made at Lisbon, and Mr. Flamsteed's own Observation of the Eclipse of Jupiter by the Moon on March 31th. past. I give you here a Catalogue of all the Eclipses of its Satellites, for the ensuing year 1687, and together with it 2 Tables, one of his Geocentric places, the other of the Parallaxes of his Orbit to every day in the said Year. This is the 4th. Catalogue I have got published in the Transactions. With the 1st. printed Dec. 1683. Num. 154. I shewed their uses, and how by their help the difference of Longitude, betwixt any two places on the Earth, where they should be observed, might be determined. And I Taught a Method of finding out within what space on our Globe any of them would be observable: This was done in English for the use of our Country-men. Next Year in December 1684. I repeated those Directions in Latin Num. 165. pag. 760. for the benefit of Forreigners. In the two Transactions of Decem. 85. Num. 177 and 178, with the Catalogue of Eclipses I described a small Instrument, and shewed by the help of it, the said Catalogue, and the Tables of 4 Geocentric places and Parallexes, the appearances of the Satellites at any time within the compass of that Year might be discovered and delineated; if therefore the Reader desire to be informed concerning the use of the Catalogue and Tables herewith print- ed, he may repair to the above-mentioned Transactions. I shall only add. That whereas for the two Years last past, the 4th. Satellit has not been Eclipsed. As this Year enters, it begins to fall into its shadow, and that its Eclipse will again be observable for the 4 next Years. The first that happens Feb. 2. in the Morning will be well worth the attention of the Curious; in that its duration is the shortest of any that follow it this Year; both the Ingress and Emergence are Visible with us, as are all those in the Catalogue which are alike marked with an Asterisk (*) which if they shall be exactly observed, may serve to determine the place of the Node of the orbit of its Satellites, and its Inclination to the orbit of 4, by comparing the observation either with such as we have already obtained, or as may be made hereafter. In my last observations, the Eclipses of the 2d and 3d Satellit have anticipated my Calculations something more than I expected in so short a time; of which I thought it convenient to acquaint the Reader, that he may attend them one quarter of an hour earlier than the times noted in the Catalogue. In 2 or 3 Years more we may expect opportunities of observations, which will afford us such a correction for the error, that the Numbers shall fail no more in them, than in the 1st. whose Eclipses have not yet differed above 3 minutes from the Calculation. I give you further herewith an observation of the Lunar Eclipse November 30, 1685. made at Lisbon by my kind Friend Mr. Henry Jacobs: and another of my own of the Occultation of 4 by the Moon, March the 31st. this Year 1686: of which you have published several foreign observations already. | Janua | Febru. | Martii. | April. | Maii. | Juni. | |-------|--------|---------|--------|-------|-------| | D | A | G. M. | A | G. M. | A | G. M. | S | D | | 1 | 6 | 30 | 9 | 36 | 10 | 49 | 9 | 41 | 5 | 48 | 0 | 10 | 1 | | 2 | 6 | 38 | 9 | 41 | 10 | 49 | 9 | 36 | 5 | 38 | 0 | 29 | 2 | | 3 | 6 | 44 | 9 | 45 | 10 | 50 | 9 | 31 | 5 | 27 | 0 | 41 | 3 | | 4 | 6 | 52 | 9 | 49 | 10 | 50 | 9 | 25 | 5 | 17 | 0 | 54 | 4 | | 5 | 6 | 59 | 9 | 53 | 10 | 50 | 9 | 19 | 5 | 06 | 1 | 06 | 5 | | 6 | 7 | 06 | 9 | 57 | 10 | 49 | 9 | 13 | 4 | 55 | 1 | 19 | 6 | | 7 | 7 | 13 | 10 | 01 | 10 | 49 | 9 | 07 | 4 | 44 | 1 | 31 | 7 | | 8 | 7 | 20 | 10 | 04 | 10 | 48 | 9 | 01 | 4 | 33 | 1 | 44 | 8 | | 9 | 7 | 26 | 10 | 08 | 10 | 48 | 8 | 55 | 4 | 22 | 1 | 56 | 9 | | 10 | 7 | 33 | 10 | 11 | 10 | 47 | 8 | 48 | 4 | 11 | 2 | 08 | 10 | | 11 | 7 | 40 | 10 | 14 | 10 | 46 | 3 | 41 | 3 | 59 | 2 | 21 | 11 | | 12 | 7 | 46 | 10 | 18 | 10 | 44 | 8 | 34 | 3 | 48 | 2 | 33 | 12 | | 13 | 7 | 53 | 10 | 21 | 10 | 42 | 8 | 27 | 3 | 36 | 2 | 45 | 13 | | 14 | 7 | 59 | 10 | 24 | 10 | 41 | 8 | 19 | 3 | 24 | 2 | 57 | 14 | | 15 | 8 | 06 | 10 | 26 | 10 | 40 | 8 | 12 | 3 | 12 | 3 | 09 | 15 | | 16 | 8 | 11 | 10 | 29 | 10 | 38 | 8 | 04 | 3 | 00 | 3 | 21 | 16 | | 17 | 8 | 17 | 10 | 31 | 10 | 36 | 7 | 56 | 2 | 48 | 3 | 33 | 17 | | 18 | 8 | 23 | 10 | 34 | 10 | 33 | 7 | 48 | 2 | 37 | 3 | 44 | 18 | | 19 | 8 | 29 | 10 | 36 | 10 | 31 | 7 | 40 | 2 | 25 | 3 | 56 | 19 | | 20 | 8 | 35 | 10 | 38 | 10 | 28 | 7 | 32 | 2 | 12 | 4 | 08 | 20 | | 21 | 8 | 41 | 10 | 40 | 10 | 25 | 7 | 23 | 2 | 00 | 4 | 19 | 21 | | 22 | 8 | 46 | 10 | 41 | 10 | 22 | 7 | 14 | 1 | 48 | 4 | 30 | 22 | | 23 | 8 | 52 | 10 | 43 | 10 | 19 | 7 | 05 | 1 | 35 | 4 | 42 | 23 | | 24 | 8 | 57 | 10 | 44 | 10 | 15 | 6 | 56 | 1 | 23 | 4 | 53 | 24 | | 25 | 9 | 02 | 10 | 45 | 10 | 12 | 6 | 47 | 1 | 11 | 5 | 04 | 25 | | 26 | 9 | 08 | 10 | 46 | 10 | 08 | 6 | 37 | 0 | 58 | 5 | 15 | 26 | | 27 | 9 | 13 | 10 | 47 | 10 | 04 | 6 | 28 | 0 | 45 | 5 | 25 | 27 | | 28 | 9 | 17 | 10 | 48 | 10 | 00 | 6 | 18 | 0 | 33 | 5 | 36 | 28 | | 29 | 9 | 22 | | | | | | | | | | | | | 30 | 9 | 27 | | | | | | | | | | | | | 31 | 9 | 31 | | | | | | | | | | | | | D | Iulii | Augu. | Sept. | Octob. | Novem. | Dec. | |---|-------|-------|-------|--------|--------|------| | | G. M. | G. M. | G. M. | G. M. | G. M. | G. M.| | 1 | 6 | 07 | 10 | 02 | 11 | 02 | | 2 | 6 | 17 | 10 | 06 | 11 | 02 | | 3 | 6 | 27 | 10 | 11 | 11 | 01 | | 4 | 6 | 37 | 10 | 15 | 11 | 00 | | 5 | 6 | 47 | 10 | 19 | 10 | 59 | | 6 | 6 | 56 | 10 | 23 | 10 | 57 | | 7 | 7 | 05 | 10 | 27 | 10 | 56 | | 8 | 7 | 14 | 10 | 31 | 10 | 54 | | 9 | 7 | 23 | 10 | 34 | 10 | 52 | | 10| 7 | 32 | 10 | 37 | 10 | 50 | | 11| 7 | 41 | 10 | 40 | 10 | 48 | | 12| 7 | 49 | 10 | 43 | 10 | 46 | | 13| 7 | 57 | 10 | 46 | 10 | 43 | | 14| 8 | 05 | 10 | 48 | 10 | 41 | | 15| 8 | 14 | 10 | 50 | 10 | 38 | | 16| 8 | 21 | 10 | 52 | 10 | 35 | | 17| 8 | 29 | 10 | 54 | 10 | 32 | | 18| 8 | 36 | 10 | 56 | 10 | 29 | | 19| 8 | 44 | 10 | 57 | 10 | 26 | | 20| 8 | 51 | 10 | 59 | 10 | 23 | | 21| 8 | 58 | 11 | 00 | 10 | 19 | | 22| 9 | 05 | 11 | 01 | 10 | 15 | | 23| 9 | 11 | 11 | 02 | 10 | 11 | | 24| 9 | 28 | 11 | 03 | 10 | 08 | | 25| 9 | 24 | 11 | 03 | 10 | 04 | | 26| 9 | 30 | 11 | 04 | 10 | 00 | | 27| 9 | 35 | 11 | 04 | 9 | 56 | | 28| 9 | 4 | 11 | 0 | 9 | 51 | | 29| 9 | 46 | 11 | 0 | 9 | 47 | | 30| 9 | 5 | 11 | 04 | 9 | 42 | | 31| 9 | 57 | 11 | 03 | 6 | 32 | | Catalogus Eclipsium Comitum Jovialium ubique Terrarum Anno in- | |---------------------------------------------------------------| | Januarii. | Februarii. | Martiri. | | D. H. M. | D. H. M. | D. H. M. | |-----------|-----------|-----------| | 1 01 27 | 1 02 10 | 1 15 04 | | 2 09 34 | 1 17 20 | 1 18 06 | | 19 55 | 1 18 20 | 2 05 27 | | 3 07 23 | 2 21 51 | 3 19 25 | | 4 14 22 | 3 09 04 | 2 23 56 | | 5 22 50 | 1 16 19 | 5 18 26 | | 6 08 50 | 5 10 47 | 7 05 05 | | 8 03 17 | 6 22 21 | 6 43 4 | | 9 12 06 | 7 05 16 | 8 44 2 | | 21 45 | 8 03 08 | 12 54 | | 10 11 18 | 6 08 3 | 8 19 0 | | 11 16 13 | 23 44 | 22 06 | | 13 01 23 | 10 11 39 | 9 07 22 | | 10 41 | 18 13 | 10 22 02 | | 15 05 09 | 12 12 41 | 11 01 52 | | 23 53 | 14 00 56 | 12 20 20 | | 16 14 39 | 7 10 1 | 14 11 40 | | 23 37 | 15 7 06 | 14 49 | | 17 15 15 | 10 07 | 15 23 03 | | 18 14 3 | 6 01 38 | 6 02 06 | | 18 18 05 | 17 14 14 | 9 18 | | 20 03 56 | 20 07 | 18 00 39 | | 22 07 01 | 18 11 11 | 3 47 | | 23 17 12 | 12 32 | 19 22 36 | | 24 01 29 | 19 14 35 | 21 13 57 | | 19 12 | 21 03 32 | 16 44 | | 22 11 | 9 04 | 23 03 03 | | 25 19 57 | 22 11 05 | 6 07 | | 27 06 29 | 14 06 | 11 13 | | 14 25 | 23 03 33 | 23 02 | | 29 08 54 | 24 16 50 | 24 0 54 | | 30 19 47 | 22 01 | 25 3 15 | | 31 03 22 | 26 16 30 | 5 42 | | 23 10 3 | 28 06 07 | 27 00 11 | | 10 59 | 28 16 34 | 18 39 | | 30 07 02 | 10 08 3 | 13 09 | * indicates a partial eclipse sequente 1687 visibilium, tempora Ingrefsiuum illorum in 45 Umbra, & ab ea Emerfionum fub Meridiano Grenovicano apparentia exhibens, Juxta Calculum fo. Flamstedii Math. Reg. & R. S. S. | Aprilis | Maii | Junii | |---------|------|-------| | D. H. M. | D. H. M. | D. H. M. | | 1 05 52 | 1 09 44 | 2 08 30 | | 7 37 1 | 3 04 13 | 21 59 3 | | 3 02 06 | 5 33 2 | 4 02 58 | | 4 19 10 | 4 22 41 | 7 54 2 | | 20 35 | 5 02 58 | 5 21 27 | | 6 11 02 | 6 17 10 | 7 15 55 | | 14 08 3 | 18 50 2 | 21 12 2 | | 15 04 * | 8 11 38 | 9 10 23 | | 8 08 28 | 10 6 06 | 10 01 57 | | 9 33 1 | 7 07 2 | 11 04 51 | | 9 17 00 * | 12 00 35 | 10 29 2 | | 19 04 4 | 6 56 3 | 12 23 20 | | 10 04 01 | 13 4 53 | 14 17 48 | | 11 21 46 | 6 17 | 23 45 | | 22 30 1 | 19 03 | 15 16 41 | | 13 15 02 | 21 24 | 19 57 | | 16 59 1 | 15 13 31 | 16 12 16 | | 18 08 3 | 17 08 00 | 17 05 55 | | 15 11 04 | 10 42 2 | 18 06 44 | | 11 27 1 | 19 02 28 | 13 03 2 | | 17 05 56 | 10 54 3 | 20 01 13 | | 19 00 22 | 20 20 56 | 21 19 41 | | 0 25 1 | 23 59 2 | 22 02 21 | | 20 18 54 | 22 15 24 | 23 14 10 | | 19 01 3 | 24 09 53 | 24 09 54 | | 22 13 23 | 13 16 2 | 25 08 38 | | 13 40 2 | 26 04 21 | 15 38 2 | | 24 07 50 | 14 51 3 | 27 03 07 | | 26 02 19 | 27 22 49 | 28 21 34 | | 2 57 2 | 28 02 33 | 29 04 55 | | 10 56 * | 29 17 17 | 30 36 03 | | 13 12 4 | 8 02 22 46 | | | 27 20 47 | 30 01 24 | | | 23 00 3 | 31 14 02 | | | 29 15 14 2 | 18 36 2 | | * Indicates a note or additional information. | Julii | Augusti | Septemb. | |-------|---------|----------| | D. H. M. | D. H. M. | D. H. M. | | 1 13 53 | 1 12 42 | 1 04 33 | | 2 10 32 | 3 07 11 | 2 09 29 | | 10 38 4 | 17 58 2 | 3 22 48 | | 13 32 4 | 4 22 40 | 4 02 07 | | 18 13 2 | 5 1 40 | 3 59 1 | | 4 05 00 | 1 52 4 | 17 53 2 | | 5 23 29 | 6 06 40 | 5 22 28 | | 6 07 32 | 9 56 3 | 7 10 55 | | 7 17 57 | 20 09 1 | 14 21 4 | | 8 17 52 | 7 07 17 | 16 58 1 | | 9 12 26 | 8 14 38 | 8 07 13 | | 20 59 2 | 10 09 07 | 9 11 27 | | 11 06 55 | 20 37 2 | 11 02 51 | | 13 01 23 | 12 03 37 | 5 57 1 | | 10 07 2 | 13 10 42 | 6 10 3 | | 14 19 52 | 13 58 3 | 20 32 2 | | 15 18 38 | 22 06 1 | 13 00 26 | | 21 52 3 | 14 09 56 | 14 18 56 | | 16 14 21 | 15 16 35 | 15 09 52 | | 23 25 2 | 17 11 05 | 16 13 25 | | 18 08 50 | 23 15 2 | 18 06 54 | | 19 04 38 | 19 05 34 | 7 54 1 | | 7 40 4 | 20 41 44 | 10 13 3 | | 20 03 19 | 18 01 3 | 23 12 2 | | 12 43 2 | 21 00 03 | 20 02 24 | | 21 21 47 | 12 35 2 | 21 20 54 | | 22 22 38 | 16 47 4 | 22 12 31 | | 23 01 53 | 20 05 4 | 23 15 23 | | 16 16 1 | 22 18 33 | 24 05 03 | | 24 02 02 | 24 13 02 | 8 37 4 | | 25 10 45 | 25 01 54 | 25 09 52 | | 27 05 14 | 26 07 32 | 10 56 3 | | 15 21 2 | 27 18 46 | 14 16 3 | | 28 23 43 | 22 03 3 | 26 01 51 | | 30 02 39 | 28 02 01 | 27 04 22 | | 05 54 3 | 15 14 2 | 28 22 51 | | 18 12 1 | 29 20 30 | 29 15 10 | | 31 04 39 | 31 15 00 | 30 17 20 | | Octobris | Novembr. | Decembre | |----------|----------|----------| | D. H. M. | D. H. M. | D. H. M. | | 2 11 49 | 1 14 01 | e e e | | 14 58 3 | 3 08 26 | i i i | | 18 18 3 | 4 04 15 | *e e | | 3 04 29 | 5 02 58 | i i | | 4 06 19 | 6 21 26 | i i | | 6 00 48 | 7 14 21 | i i | | 17 48 2 | 17 32 2 | e e | | 7 19 17 | 8 15 54 | i i | | 9 13 46 | 10 10 23 | i i | | 18 59 3 | 11 06 50 | i i | | 22 20 3 | 12 04 51 | i i | | 10 07 07 | 13 11 15 | i i | | 23 11 4 | 15 04 4 | i i | | 11 02 49 | 23 19 1 | i i | | 8 15 1 | 14 20 07 | i i | | 13 02 44 | 18 20 3 | i i | | 20 26 2 | 15 17 47 | i i | | 14 21 13 | 17 12 15 | i i | | 16 15 42 | 18 09 24 | i i | | 23 00 3 | 19 06 43 | i i | | 17 02 22 | 21 01 12 | i i | | 9 45 2 | 22 17 3 | i i | | 18 10 11 | 22 40 2 | i i | | 20 04 40 | 22 19 39 | i i | | 23 03 2 | 24 14 07 | i i | | 21 23 09 | 25 11 57 | i i | | 23 17 37 | 26 08 35 | i i | | 24 06 23 | 28 03 03 | i i | | 12 21 2 | 29 01 13 | i i | | 25 12 06 | 2 14 3 | i i | | 27 06 35 | 21 30 1 | i i | | 17 13 4 | 30 05 04 | i i | | 20 59 4 | 9 00 4 | i i | | 28 01 39 | 2 e | | 29 01 03 | 1 e | | 30 19 32 | 1 e | | 31 10 22 | 3 e | | 14 57 2 | 2 e | *Toto Decembre Jupiter latet sub Radiis Solis.* | Janu. | Febru. | March. | April. | May. | June. | |-------|--------|--------|--------|------|-------| | G. M. | G. M. | G. M. | G. M. | G. M.| G. M. | | 1 | 13 46 | 19 19 | 22 46 | 18 07 | 22 39 | 19 05 | | 2 | 13 58 | 19 29 | 22 51 | 24 07 | 22 34 | 18 57 | | 3 | 14 10 | 19 38 | 22 57 | 24 07 | 22 28 | 18 49 | | 4 | 14 22 | 19 47 | 23 02 | 24 06 | 22 22 | 18 42 | | 5 | 14 34 | 19 55 | 23 06 | 24 05 | 22 16 | 18 34 | | 6 | 14 45 | 20 04 | 23 11 | 24 04 | 22 10 | 18 27 | | 7 | 14 57 | 20 12 | 23 15 | 24 03 | 22 04 | 18 19 | | 8 | 15 09 | 20 21 | 23 20 | 24 01 | 21 58 | 18 11 | | 9 | 15 20 | 20 29 | 23 24 | 23 59 | 21 52 | 18 04 | | 10 | 15 32 | 20 38 | 23 27 | 23 58 | 21 45 | 17 56 | | 11 | 15 43 | 20 46 | 23 31 | 23 56 | 21 39 | 17 48 | | 12 | 15 54 | 20 54 | 23 35 | 23 54 | 21 32 | 17 41 | | 13 | 16 06 | 21 01 | 23 38 | 23 51 | 21 25 | 17 34 | | 14 | 16 16 | 21 09 | 23 41 | 23 49 | 21 18 | 17 27 | | 15 | 16 27 | 21 17 | 23 44 | 23 46 | 21 11 | 17 20 | | 16 | 16 38 | 21 24 | 23 47 | 23 43 | 21 04 | 17 13 | | 17 | 16 49 | 21 32 | 23 50 | 23 40 | 20 57 | 17 06 | | 18 | 17 00 | 21 38 | 23 52 | 23 37 | 20 50 | 16 59 | | 19 | 17 10 | 21 45 | 23 55 | 23 33 | 20 43 | 16 52 | | 20 | 17 21 | 21 52 | 23 57 | 23 30 | 20 35 | 16 46 | | 21 | 17 32 | 21 59 | 23 59 | 23 26 | 20 28 | 16 39 | | 22 | 17 42 | 22 05 | 24 00 | 23 22 | 20 20 | 16 33 | | 23 | 17 52 | 22 12 | 24 02 | 23 18 | 20 14 | 16 26 | | 24 | 18 02 | 22 18 | 24 03 | 23 14 | 20 06 | 16 20 | | 25 | 18 12 | 22 24 | 24 04 | 23 09 | 19 58 | 16 14 | | 26 | 18 23 | 22 30 | 24 05 | 23 04 | 19 50 | 16 08 | | 27 | 18 33 | 22 35 | 24 06 | 23 00 | 19 43 | 16 02 | | 28 | 18 42 | 22 41 | 24 07 | 22 56 | 19 35 | 15 56 | | 29 | 18 51 | 24 07 | 22 50 | 19 28 | 15 51 | | 30 | 19 00 | 24 08 | 22 45 | 19 20 | 15 44 | | 31 | 19 10 | 24 08 | 19 12 | 15 31 | | Julii | August | Septem | Octob. | Novem. | Decem. | |-------|--------|--------|--------|--------|--------| | G. M. | G. M. | G. M. | G. M. | G. M. | G. M. | | 1 | 15 | 40 | 14 | D | 17 | | | | | | | | | 2 | 15 | 34 | 14 | 17 | 15 | | | | | | | | | 3 | 15 | 29 | 14 | 17 | 15 | | | | | | | | | 4 | 15 | 24 | 14 | 17 | 16 | | | | | | | | | 5 | 15 | 20 | 14 | 18 | 16 | | | | | | | | | 6 | 15 | 15 | 14 | 19 | 16 | | | | | | | | | 7 | 15 | 11 | 14 | 21 | 16 | | | | | | | | | 8 | 15 | 07 | 14 | 22 | 16 | | | | | | | | | 9 | 15 | 03 | 14 | 23 | 16 | | | | | | | | | 10 | 14 | 59 | 14 | 25 | 16 | | | | | | | | | 11 | 14 | 55 | 14 | 27 | 16 | | | | | | | | | 12 | 14 | 51 | 14 | 29 | 16 | | | | | | | | | 13 | 14 | 48 | 14 | 31 | 17 | | | | | | | | | 14 | 14 | 45 | 14 | 34 | 17 | | | | | | | | | 15 | 14 | 42 | 14 | 36 | 17 | | | | | | | | | 16 | 14 | 39 | 14 | 39 | 17 | | | | | | | | | 17 | 14 | 36 | 14 | 42 | 17 | | | | | | | | | 18 | 14 | 33 | 14 | 45 | 17 | | | | | | | | | 19 | 14 | 31 | 14 | 49 | 17 | | | | | | | | | 20 | 14 | 28 | 14 | 52 | 18 | | | | | | | | | 21 | 14 | 26 | 14 | 56 | 18 | | | | | | | | | 22 | 14 | 25 | 15 | 00 | 18 | | | | | | | | | 23 | 14 | 23 | 15 | 04 | 18 | | | | | | | | | 24 | 14 | 21 | 15 | 08 | 18 | | | | | | | | | 25 | 14 | 20 | 15 | 12 | 18 | | | | | | | | | 26 | 14 | 19 | 15 | 17 | 18 | | | | | | | | | 27 | 14 | 18 | 15 | 21 | 19 | | | | | | | | | 28 | 14 | 17 | 15 | 26 | 19 | | | | | | | | | 29 | 14 | 17 | 15 | 31 | 19 | | | | | | | | | 30 | 14 | 17 | 15 | 37 | 19 | | | | | | | | | 31 | 14 | 17 | 15 | 42 | 25 | Defectus Lunaris Ulissipponae a Do. Jacobeo Observatus Nov. 30. 1686. H. M. Initium 8 02 Immersio 9 06 Emergo 10 50 Finis 11 57 Jovis a Luna tecti Observationes Grenovici habitae a Jo. Flamsteedio Math. Reg. Martii 31. 1686. | Temp. corr | per hor. oscil | |------------|---------------| | H. M. S. | | Martii 31 9. 32. 30 u s limbus tangebat limbum Lunæ lucidum, Mareotidis diametrum a termino ejus boreo. 33. 42 u Totus tectus erat. Quantum per vapores horizonis & unaulationem limbi valde turbidam, licuit conjicere. 10. 11. 12 Differentia declinationem limbi Lunæ vere Austrini & loci Ingressus, Tubo ped. 3 & Micrometro 1546 = 12 m. 42 sec. 30. 30 Jovis particula emergerat, e regione realis limbi Maeotidis. 31. 36 Jupiter totus liber. 35. 50 Differentia declinationum centri Jovis, & limbi Lunæ Austrini 3436 = 28m. 5s. 41. 40 Repet. 3585 = 29m. 28s. 44. 00 Luna Diameter 3906 = 32m. 07s. 45. 44 Repet. 3915 = 32m. 11s. Ac-