The Quarterly Journal of Science, Literature and the Arts, July-December, 1827 - Various

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London, 18 Nov. 1827.

[p450]

iv. Calculations of LUNAR PHENOMENA. By THOMAS HENDERSON, Esq. [◊]

PrincipalLUNAROCCULTATIONS of the Fixed Stars in theMonths of January, February, March, and April, 1828; calculatedfor the Royal Observatory at Greenwich.
Date.		Names of Stars.	Magn- itude.	Immersion and Emersion. Mean Time.				Apparent Difference of Declination.^*			Point of Moon’s Limb.
					H.	M.	S.	′	″		°
Jan.	4	κ Cancri	5.6	Imm.	10	51	43	13	18	S.	172	R.
				Em.	11	44	48	7	19	S.	91	R.
	31	α¹ Cancri	6	Imm.	11	14	52	7	45	S.	134	L.
				Em.	12	35	56	2	19	N.	88	R.
	"	κ Cancri	5.6	Imm.	18	38	0	0	58	N.	47	L.
				Em.	Under			Horizon.
Feb.	7	α² Libræ	3	Imm.	20	29	54	1	35	S.	69	L.
				Em.	21	37	54	4	33	N.	107	R.
	22	δ³ Tauri	5	Imm.	7	0	9	3	47	S.	90	L.
				Em.	8	16	39	6	34	S.	146	R.
	28	ω Leonis	6.7	Imm.	11	24	25	14	57	S.	165	L.
				Em.	12	3	15	9	17	S.	145	R.
March	10	ρ¹ Sagit- tarii	5	Imm.	16	14	54	4	24	N.	105	L.
				Em.	17	20	39	1	25	N.	62	R.
	23	u Gemin- orum	5.6	Imm.	8	4	36	2	48	N.	55	L.
				Em.	9	18	11	7	46	N.	94	R.
	24	k Gemin- orum	5	Imm.	9	12	5	3	53	S.	78	L.
				Em.	10	28	34	3	55	N.	111	R.
	26	κ Cancri	5.6	Imm.	7	41	25	7	6	S.	132	L.
				Em.	9	3	38	3	14	N.	83	R.
April	2	ν¹ Libræ	6	Imm.	14	7	43	12	43	N.	38	L.
				Em.	14	34	56	15	49	N.	10	R.
		ν² Libræ	6.7	Imm.	13	58	36	2	1	S.	99	L.
				Em.	15	13	58	6	19	N.	76	R.
	29	α¹ Libræ	6	Imm.	16	15	38	14	48	S.	126	L.
				Em.	16	48	16	11	55	S.	174	R.
		α² Libræ	3	Imm.	16	33	5	15	54	S.	145	L.
				Em.	16	43	5	15	3	S.	162	L.

The fifth column shows the apparent difference of declination between the Star and Moon’s centre at the immersion and emersion; the letters N and S denoting the Star to be north or south from the Moon. The sixth or last column shows the point of the Moon’s limb where the immersion and emersion take place, reckoning from the vertex or highest point; the letters L and R signifying to the left hand or right hand of the observer.

An error of 11 seconds in the computed difference of declination between the Moon and Star, will be sufficient to convert the expected Occultation of α² Libræ, on 29th April, into an Appulse; and a less error will considerably affect the times and places of immersion and emersion.

[To be continued.] [p451]

ELEMENTSfor computing theECLIPSESof theSUN andOCCULTATIONS of thePLANETS by theMOON, in the Year 1828.
Conjunction in A. R. Apparent Time.					Diff. Dec.			Relative H. M.		Relative Orb. Ang.				or Planet’s A. R. at			or Planet’s N. P. D. at
	D.	H.	M.	S.	′	″		′	″		°	′		H.	M.	S.	°	′	″
Jan.	11	10	47	11	21	1	S.	34	6	S.	76	58	E.	14	35	47	104	2	30
Jan.	11	16	40	36	4	29	N.	33	14	S.	78	4		14	49	29	105	12	34
Feb.	7	22	17	54	5	44	N.	33	26	S.	77	35		14	46	40	104	48	7
Mar.	6	4	48	7	16	46	N.	33	29	S.	77	47		14	49	7	104	53	57
April	2	8	6	49	9	6	N.	34	12	S.	77	26		14	42	44	104	21	7
April	13	21	23	53	8	50	N.	31	23	N.	74	7		1	30	20	80	32	14
April	29	10	49	53	9	3	S.	34	50	S.	76	40		14	30	21	103	22	5
May	12	8	58	41	7	44	N.	27	31	N.	78	28		2	30	50	76	35	6
May	26	14	58	46	20	58	S.	34	38	S.	75	54		14	17	53	102	23	57
June	22	21	27	33	14	27	S.	33	40	S.	75	26		14	11	5	101	55	51
July	13	12	0	30	68	43	S.	30	15	S.	76	50		8	55	0	76	17	27
July	20	6	18	33	10	12	N.	32	33	S.	75	28		14	12	35	102	11	28
Aug.	16	17	18	6	44	49	N.	31	50	S.	75	59		14	22	10	103	7	21
Sept.	5	3	7	12	4	10	S.	28	8	S.	78	3		8	13	4	75	7	21
Oct.	8	12	23	35	6	39	S.	29	6	S.	73	2		12	57	44	96	10	27
Dec.	3	13	30	46	39	10	S.	29	39	S.	75	23		14	3	58	100	19	38

ELEMENTSfor computing theECLIPSESof theSUN andOCCULTATIONS of thePLANETS by theMOON, in the Year 1828. [continuedfrom above]
Conjunction in A. R. Apparent Time.					Nearest Appr- oach.		Time of nearest Approach, Apparent Time.				or Planet’s
											Horary	Motion	Semi-diam-eter	Hor. Par.
											in A. R. in Time.	in N. P. D.	Semi-diam-eter	Hor. Par.
	D.	H.	M.	S.	′	″	D.	H.	M.	S.	SEC.	″	″	″
Jan.	11	10	47	11	20	28	11	10	38	51	+1·3	+6	17	2
Jan.	11	16	40	36	4	23	11	16	42	16	+5·9	+27	3	5
Feb.	7	22	17	54	5	36	7	22	20	7	+0·6	+2	18	2
Mar.	6	4	48	7	16	23	6	4	54	29	−0·2	−1	20	2
April	2	8	6	49	8	53	2	8	10	18	−0·9	−4	21	2
April	13	21	23	53	8	30	13	21	19	16	+9·2	−54	958	9
April	29	10	49	53	8	48	29	10	46	17	−1·2	−6	22	2
May	12	8	58	41	7	35	12	8	55	19	+19·8	−119	3	7
May	26	14	58	46	20	20	26	14	49	55	−0·9	−4	21	2
June	22	21	27	33	13	59	22	21	21	5	−0·3	−1	20	2
July	13	12	0	30	66	55	13	11	29	28	−3·4	+22	26	27
July	20	6	18	33	9	53	20	6	23	16	+0·5	+3	18	2
Aug.	16	17	18	6	43	29	16	17	38	31	+1·2	+6	17	2
Sept.	5	3	7	12	4	5	5	3	5	22	+5·8	−1	18	19
Oct.	8	12	23	35	6	21	8	12	19	35	+9·2	+57	963	9
Dec.	3	13	30	46	37	54	3	13	10	46	+11·5	+61	7	8