Philosophical transactions, Vol. L. Part II. For the year 1758. / Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.

by Various; Royal Society

Wm. Chapman.

LXXXVIII. Observatio Eclipsis Lunaris facta Matriti a Pª. Joanne Wendlingen, Societatis Jesu, in Regali Observatorio Collegii Imperialis ejusdem Societatis, Die 30 Julii 1757.

Quælibet observatio bis instituta fuit, semel interjecto oculum inter lentemque ocularem vitri clari, cærulei, plani, ac bene tersi, fragmento. Hæ observationes notantur hac voce cerul. Telescopium, quo usus sum, est Gregorianum trium pedum Anglicanorum, omnino præclarum.

Communicated by Matthew Maty, M. D. F.R.S.

[Read April 20, 1758.]

IMMERSIONES.			Tempus		verum	Differentia
			h	´	´´
PRincipium eclipsis,		clar.	9	47	34
Mare Humorum,		clar.	—	52	47
Grimaldus		cær.	—	54	28	´´
		clar.	—	55	27	—— 59
Bullialdus		cær.	10	1	21	—— 13
		——	10	1	34
Keplerus		——	—	9	35	—— 10
		——	—	9	45
Copernicus		——	—	16	15	—— 12
		——	—	16	28
Heraclides		——	—	18	14	—— 10
		——	—	18	24
Manilius		clar.	10	30	43	´´
		cær.	10	30	54	—— 11
Menelaus		——	—	34	11	—— 9
		——	—	34	20
Promontorium		——	—	44	49	—— 9
		——	—	44	58
Mare Crisium		——	—	45	33	—— 11
		——	—	45	44
Proclus, clar.			—	46	54
Plato		——	—	54	48	—— 14
		——	—	55	2
Langrenus		——	11	7	3	—— 20
		——	11	7	23

EMERSIONES.			Tempus		verum	Differentia
			h	´	´´
Plato		clar.	11	40	34	´´
		cær.	11	40	48	—— 14
Heraclides		——	—	41	27	—— 12
		——	—	41	39
Grimaldus		——	—	47	57	—— 7
		——	—	48	4
Keplerus		——	—	52	58	—— 10
		——	—	53	8
Copernicus		——	12	1	36	—— 12
		——	12	1	48
Menelaus		——	—	17	18	—— 10
		——	—	17	28
Finis eclipseos, clar.			—	52	15

Observatio Eclipsis Lunaris, facta ab eodem, eodem modo, eodem loco, iisdemque instrumentis Die 24 Januar. Anni 1758.

Ab hora 5^ta usque ad finem observationis tantum commovebatur imprægnata plurimum vaporibus athmosphæra, ut tota lunæ illuminatæ portio præter morem undulare videretur. Flabat boreas, indicante thermometro Reaumuriano. 1. grandem infra aquæ congelationem.

IMMERSIONES.			Tempus		verum	Differentia
			h	´	´´
Principium			4	7	42	´´
Grimaldus		cær.	—	9	55	—— 38
		clar.	—	10	33
Aristarchus		——	—	15	37	—— 34
		——	—	16	11
Mare Humorum		——	—	20	48	—— 24
		——	—	21	12
Copernicus		——	—	26	45	—— 13
		——	—	26	58
Plato		——	—	35	41	—— 41
		——	—	36	22
Tycho		——	—	39	31	—— 38
		——	—	40	9
Menelaus		——	—	45	43	—— 39
		——	—	46	22
Plinius		——	—	50	17	—— 27
		——	—	50	44
Promontorium Somni		——	—	58	15	—— 27
		——	—	58	42
Cleomedes		——	5	0	22	—— 14
		——	5	0	36
Proclus		cær.	5	2	9	´´
		clar.	5	2	15	—— 6
Princip. Maris Crisii		——	—	3	6	—— 25
		——	—	3	31
Langrenus		——	—	7	40	—— 14
		——	—	7	54
Immers. tot. Maris Crisii		——	—	8	19	—— 11
		——	—	8	30
Immersio totalis Lunæ		——	—	12	50	—— 40
		——	—	13	30