CHAP. III. How to place the fixed Stars in the Sphere, and also in the outward Eclipticall Circle, for the speedy find∣ing of the houre of the night in all Latitudes.

FIrst, you must get both the Right Ascension and De∣clination, of such Stars as you intend to place in your Page  8 Instrument; the finding whereof shall hereafter appeare: these being knowne; upon the Stars parallel of Declina∣tion, seek his Right Ascension, amongst the Meridians or houre Circles; and at the point of intersection, betwixt the stars Declination, and Right Ascension, there place the Star.

As for Example, suppose I would place Arcturus in the Sphere, first, I inquire his Right Ascension and De∣clination, either by the propositions hereafter for that purpose, or by this ensuing Table; and so finde his Right Ascension to be 13 houres 59 minutes and his Declinati∣on to be 21 degrees 10 minutes North; therefore upon the 21 parallel and 10 minutes I number 14 houres from ♈ unto ♋, and so back again unto 14, and there I place Arcturus; the like may be done with any other Star.

Now what Stars you place in the Sphere, the same place in the outward Ecliptique; which may be done af∣ter this manner: enter your Table of Right Ascensions, with the Right Ascension of the Star, and see what de∣gree of the Ecliptique answers thereto, and place the Star upon the same.

As for example, the Right Ascension of Arcturus be∣ing 14 houres, I enter the Table of right Ascensions therewith, and I finde 2 degrees of ♏, answer thereunto; therefore Arcturus must be placed at 2 degrees of ♏ in the outward Ecliptique; the like may be done with any other of the fixed Stars.

For readinesse sake, I have here inserted a Table of Right Ascensions in houres and minutes, whereby the outward Ecliptick may be divided, and the stars therein placed: and also a Table of the Right Ascension, and Declination, & magnitude, of most of the principall fixed Stars, Rectified for this present yeare, 1652

Page  [unnumbered]Page  [unnumbered]

A Table of Right Ascensions for every degree of the Ecliptique in Houres and Minutes.

Degr.	♈	♉	♊	♋	♌	♍	♎	♏	♐	♑	♒	♓
H.	M.	H.	M.	H.	M.	H.	M.	H.	M.	H.	M.	H.	M.	H.	M.	H.	M.	H.	M.	H.	M.	H.	M.
1	00	04	01	55	03	55	06	04	08	13	10	12	12	04	13	55	15	55	18	04	20	13	22	12
2	00	07	02	00	04	00	06	09	08	17	10	16	12	07	14	00	16	00	18	09	20	17	22	16
3	00	11	02	03	04	04	06	13	08	21	10	20	12	11	14	03	16	04	18	13	20	21	22	20
4	00	15	02	07	04	08	06	17	08	25	10	24	12	15	14	07	16	08	18	17	20	25	22	24
5	00	18	02	11	04	12	06	22	08	29	10	27	12	18	14	11	16	12	18	22	20	29	22	27
6	00	22	02	15	04	16	06	26	08	34	10	31	12	22	14	15	16	16	18	26	20	34	22	31
7	00	26	02	19	04	20	06	30	08	38	10	35	12	26	14	19	16	20	18	30	20	38	22	35
8	00	29	02	22	04	24	06	35	08	42	10	39	12	29	14	22	16	24	18	35	20	42	22	39
9	00	33	02	26	04	29	06	39	08	46	10	42	12	33	14	26	16	29	18	39	20	46	22	4•
10	00	37	02	30	04	33	06	43	08	50	10	46	12	37	14	30	16	33	18	43	20	50	22	46
11	00	40	02	34	04	38	06	48	08	54	10	50	12	40	14	34	16	38	18	48	20	54	22	50
12	00	44	02	38	04	42	06	52	08	58	10	54	12	44	14	38	16	42	18	52	20	58	22	54
13	00	48	02	42	04	46	06	56	09	02	10	57	12	48	14	42	16	46	18	56	21	02	22	57
14	00	52	02	46	04	50	07	01	09	06	11	01	12	52	14	46	16	50	19	01	21	06	23	01
15	00	55	02	50	04	55	07	05	09	10	11	05	12	55	14	50	16	55	19	05	21	10	23	05
16	00	59	02	54	04	59	07	09	09	14	11	08	12	59	14	54	16	59	19	09	21	14	23	08
17	01	03	02	58	05	04	07	14	09	18	11	12	13	03	14	58	17	04	19	14	21	18	23	12
18	01	06	03	02	05	08	07	18	09	22	11	16	13	06	15	02	17	08	19	18	21	22	23	16
19	01	10	03	06	05	12	07	22	09	26	11	20	13	10	15	06	17	12	19	22	21	26	23	20
20	01	14	03	10	05	16	07	27	09	30	11	23	13	14	15	10	17	16	19	27	21	30	23	23
21	01	18	03	14	05	21	07	31	09	34	11	27	13	18	15	14	17	21	19	31	21	34	23	27
22	01	21	03	18	05	25	07	35	09	37	11	31	13	21	15	18	17	25	19	35	21	37	23	31
23	01	25	03	22	05	30	07	39	09	41	11	34	13	25	15	22	17	30	19	39	21	41	23	34
24	01	29	03	26	05	34	07	44	09	45	11	38	13	29	15	26	17	34	19	44	21	45	23	38
25	01	33	03	31	05	38	07	48	09	49	11	42	13	33	15	31	17	38	19	48	21	49	23	42
26	01	36	03	35	05	42	07	52	09	53	11	49	13	36	15	35	17	42	19	52	21	53	23	45
27	01	40	03	39	05	47	07	56	09	57	11	49	13	40	15	39	17	47	19	56	21	57	23	49
28	01	44	03	43	05	51	08	00	10	01	11	53	13	44	15	43	17	51	20	00	22	01	23	53
29	01	48	03	47	05	56	08	05	10	05	11	56	13	48	15	47	17	56	20	05	22	05	23	56
30	01	52	03	51	06	00	08	09	10	08	12	00	13	52	15	51	18	00	20	09	22	08	24	00

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A Table of the Right Ascension, Declination, and Magnitude of some of the principal fixed Stars, Rectified for this present year 1652.

The Names of the Stars.	Right Ascension	Declination.	Magnitude
H.	M.	D.	M.
The Pole Star	00	32	87	19	N	2
Andromeda's girdle	00	52	33	48	N	2
The Rams horn	01	34	17	27	N	3
The Rams head	01	48	21	44	N	3
The head of Mednsa	02	46	39	32	N	3
Aldebaran, the Bulls eye.	04	16	15	48	N	1
Hircus, the Goat	04	51	45	36	N	1
Orions left foot	04	58	08	40	S	1
Orions left shoulder	05	06	05	59	N	2
The first in Orions girdle	05	14	00	38	S	2
Orions right shoulder	05	36	07	17	N	2
Sirius, the great Dog	06	31	16	13	S	1
Procyon, the lesser Dog	07	21	06	07	N	2
The heart of Hydra	09	11	07	09	S	1
Cor Leonis, the Lions heart	09	49	13	42	N	1
The Lions neck	09	50	21	49	N	2
The Lions back	10	54	22	33	N	2
The formost star in □ of the great Bear	10	40	58	23	N	2
The Lions tail	11	30	16	34	N	1
The Root of the great Bears tail, alio tail	12	38	57	51	N	2
The Virgins spike	13	08	09	16	S	1
The middlemost star in the great Bears	13	10	56	45	N	2
The last of the said tail	13	26	51	05	N	2
Arcturus	13	59	21	10	N	1
The bright star of the Crown	15	24	27	43	N	3
Antares, the Scorpions heart	16	08	25	34	S	1
The bright star of the Harp	18	25	38	30	N	1
The Eagles heart	19	33	07	58	N	2
The bright star of the Vultur	19	34	08	01	N	1
Fomahant	22	38	31	25	S	1
Pegasus shoulder	22	48	13	14	N	2
Pegasus leg.	22	52	26	09	N	2