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Meridian DATE Principal Occurrences

Jupiter's Satellites

Passage

h. m. Sidereal Time at Mean

Moon. Sun 16 Noon, 11 40 49*3.

1st Oc. D. 15 28 > Moon's First Quarter

5 324 1st Tr. I.

33
Mon 171
12 5 Conjunction of Venus and

Sh. I. 44
Saturn, 4° 49' N.

Tr. E.

9 53 Sh. E.

3rd Tr. I. Meridian passage of the

8 22 17 Tues 18 Sun, 5m. 538. before Mean 1st Ec. R.

3rd Tr. E. Noon

10 5

7 90

Sh. I. II 20
Wed 19
Io Conjunction of Moon and

2nd Tr. I.
Jupiter, 5° 37' S.

7 58:4 12 45 Occultation of 9 Aquarii(6) 4th Sh. E. Thur 20 13 36 Reappearance of ditto

9 15 12 44 Occultation of B. A.C. 7620 Fri 21 (6)

2nd Ec. R. | 9 24 47 9 38.5 13 18 Reappearance of ditto Sat 22

10 44 Near approach of Moon to

67 Aquarii (6)

IO

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8 48*2

IO 29'3

Sun 23

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5 O Full Moon
7 25 Near approach of Moon to
44 Piscium (6)

1st Tr. I. Mon 24

Eclipse of the Moon, invisi-
ble at Greenwich

Sh. I.
9 51 Conjunction of Uranus and
Mars 0° 1' N.

1st Oc. D. Tues 25

Ec. R.

3rd Tr. I. 9 42 Occultation of & Arietis (51) Wed 26 10 26 Occultation of B.A.C.755(6) 10 37 Reappearance of ditto 1st Tr. E.

Sh. E. 11 31 Reappearance of ditto Thur27

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8 42 Occultation Reappearance

of y Tauri (4)
11 40 Occultation of 75 Tauri (6)
12 41 Reappearance of ditto
12 6 Near approach of Moon to

01 Tauri (4) Fri 2812 8 Near approach of Moon to 2nd Oc. D. | 6 37 7 8.7

% Tauri (42)
12 41 Occultation of B.A.C. 1391

(5)
13 29 Reappearance of ditto
15 23 Occultation of a Tauri (2)
16 31 Reappearance of ditto

9 58 Occultation of 111 Tauri(6)

10 43 Reappearance of ditto Sat 291 20 Occultation of 117 Tauri(6) 3rd Ec. R. 8 50 511 7 49

12 13 Reappearance of ditto
18 g Moon's Last Quarter

19 41 Conjunction of Moon and Sun 30

Uranus, 5° 34' N.
22 26 Greatest easterly elonga-

2nd Sh. E. 7 14 7
tion of Venus, 46° 36'

II

THE PLANETS FOR SEPTEMBER

Mercury is at his greatest westerly elongation on the 6th of September, and rises before the sun during the month.

h.
Ist R.A.
9 38 32
Decl. + 12

Diameter 8"0
15th

40

m.

8.

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JO 41

I

IO

5":6

15th,

20

Venus reaches her greatest easterly elongation on the last day of the month, and continues to be a brilliant object for about an hour after sunset. Ist R.A. 13 23 33

Decl. 9 56 Diameter 18":4
14
28
16 191

204.8 Illuminated portion of the disc of Venus, 0.567. Mars is coming into a favourable position for observation, rising about a quarter to eleven o'clock in the evening at the beginning, and about ten o'clock at the end of the month. ist R.A, 5 37 58 Decl. t 23

Diameter 81.2
Igth
6 13 37

23 31

8".6 Illuminated portion of the disc of Mars, o•873.

II

Jupiter will still be the conspicuous planet of the evening, setting about an hour after midnight on the ist, and about eleven o'clock on the last day day of the month. Ist R.A. 19 39 18

Decl.

41 Diameter 44":6 19 37

97

44"0

22

15th 1

20

22

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Saturn is now too near the Sun to be well observed.

Neptune is now favourably fixed for observation. 6th R.A. O 47 17

Decl. t

3 20
18th
o 46 II

3 13

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THE MINOR PLANETS.

The following minor planets arrive at opposition this month :

R.A.

Decl.
Magnitude.

h.
Pomona
September 8

§ 32
Concordia
II.8

23

5 14

m,

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INSTRUMENTS, &C. FOR SALE.

These Notices, which are restricted to two lines each, are inserted free of charge to

subscribers : applications respecting prices and other particulars to be made to the Editor, with a stamped envelope for reply, without which no answer can be sent.-For

Advertisements with prices and more complete details, a small charge will be made. N.B.-It is particularly requested that we may be informed when instruments are dis

posed of, in order that the notice may be withdrawn, and fruitless applications prevented.

Achromatic Refractor, 7 in. ap. 91 ft. focus, by Troughton and Simms;

6 eye-pieces; on garden Equatorial, steadying rods, &c. [54] Achromatic Refractor, 6.4 in. ap. 87 ft. focus, by Merz, Equatorial and clockwork by Troughton & Simms.

[78] Achromatic Refractor, 4 in. ap. 5 ft. focus, by Dollond; equatorially mounted. Powers up to 400.

[87] Achromatic Refractor, 2 in. ap. 4 ft. focus, 3 pancratic eye-pieces,

powers 60 to 200, pillar and claw, and garden tripod stand. (611 Achromatic Refractor, 2ß in. ap. 42 in. focus, one day and one night eye-pieces, on tall tripod stand.

[72] Dialyte Telescope, 44 in. ap. 5 ft. focus, price very low. [88] Gregorian Reflector, 4* in. ap. 2 ft. focus, by Dollond, 4 powers, 50 to 200, finder, &c., on brass table stand.

[63] Achromatic Object-Glass, 4; in. ap. 62 in. focus, by Slugg, with brass cap and receiving cell, for mounting on tube.

[85] Newtonian Metal Speculum, 8 in. ap. first-class quality. [77] Transit Instrument, 3å in. ap. 5 ft. focus, Ys fitted with agates for mounting on stone piers.

[29] Equatorial Stand, for a 5 or 6 ft. telescope: 13 in. circles, divided on

silver, to 10% of space and 45. of time.-Has never been used. [55] Varley Stand, improved, rackwork movements, for a telescope of 5 or 6

ft. focus : on circular turn-table, to point in any direction. [16] Polar Axis, of mahogany, 7 ft. long, adapted for a 4 ft. telescope, with 12 in. circles, reading to minutes.

[56] Speculum Grinding Apparatus, capable of working a 7 ft. speculum: with tube and fittings for a 9 in. Newtonian.

[57] Recreative Science : complete in numbers, half-price.

(301

INSTRUMENTS, &c. WANTED.

Equatorial Telescope, about 6 in. aperture, with driving clock and circles; price moderate.

[89] Astronomical Clock, not very first-class; price low.

[65 Equatorial Stand, for a 5 ft. Refractor: graduated circles. [35 Transit Instrument, 2 in. ap. 18 or 24 in. focus.

[717 Monthly Notices of the Royal Astronomical Society, Vol. 3. [26] Monthly Notices : Vols. 3, 4, 5, and 7.

[82] Bartholomew Prescot on the Universe, published 1823: a copy wanted, in good condition.

[84]

ASTRONOMICAL REGISTER–Subscriptions received by the Editor,
To December 1866. Metcalf, Rev. W. R.

To June 1867.
Gribble, Rev. J. H.
Oldfield, W.

Main, Rev. R.
Lancaster, J. L.

Shawcross, W.

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LIST OF SUBSCRIBERS–Names received since our last number,

Birmingham, John, Esq., Millbrook, Tuam.
Grey, W. J., Esq., Newcastle-on-Tyne.

NOTICES TO CORRESPONDENTS.

We take the opportunity offered by a few spare lines in the “making-up" of this page to express to our readers the wish that they would resort more than they do to our column of “Brief Correspondence." We are very desirons of making our magazine do for the astronomer what Notes and Queries does for the antiquarian-serve as a resort for enquirers of every grade.

The Editor regrets that, owing to his absence from town, the publication of the present number of the Register has been much delayed; he trusts this will not occur again. Several letters, with subscriptions, &c., will be noticed in the next number.-Received for review : Mr. Proctor's Handbook of the Stars.

ERRATUM.—No. 44, p. 218, line 5 from bottom, for“ Courbe-Caisse" read “ Courbaisse."

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THE

Now ready, with Maps and Diagrams, price 5s.
HE HANDBOOK of the STARS. By RICHARD A. PROCTOR,
B.A., F.R.A.S., Author of “Saturn and its System.

London: Longmans, Green, and Co. Paternoster Row.

by Dollond, Transit and Clock. Also Twenty-six other Instruments.----For particulars, apply to John Nicholetts, Esq., South Petherton.

QUATORIAL TELESCOPE and STAND, by T. SLATER,

, London.-Object Glass, 91 in. aperture, and 12 ft. 4 in. focal length. This Telescope has been used in a private Observatory three years, and its performance on close double stars guaranteed. It has been removed in consequence of its late owner having purchased of the same maker an object glass of 16 in. diameter.

[80] BE SOLD, a great bargain, a 7-inch ACHROMATIC

, om , brass-mounted.-Eye-pieces, eight negative, 90 to 600; four positive, one day, one nebula, one comet, small diagonal, large diagonal adapter, sun prism, transit, three Barlow lenses ; Ramsden's micrometer by Berge, two reading micrometers, a position micrometer with two eye-pieces, graduated on platina, by Troughton & Simms, with slipping piece and illuminating apparatus.-On large garden Equatorial Stand, without circles; with steadying rods, and 5 in. circle on silver with level,

adapted to the telescope to find declination when on the meridian.

[81] TO BE SOLD, a 12-in. SILVERED GLASS SPECULUM,

[78]

ease.

The Astronomical Register is intended to appear at the commencement of each

month; the Subscription (including Postage) is fixed at Three Shillings per

Quarter, payable in advance, by postage stamps or otherwise. The pages of the Astronomical Register are open to all suitable communications. Letters,

Articles for insertion, &c., must be sent to the Editor, Mr. S. GORTON, Stamford Villa, Downs Road, Clapton, N.E., not later than the 15th of the month.

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(From Secchi's Bullettino Meteorologico of 31st August 1866.)

SPECTROMETERS hitherto used for the study of the stars labour under the great defect of diminishing materially the light of the objects studied ; so much so, that if the light of those objects is faint, either it is not possible to apply sufficient magnifying power to distinguish the lines, or nothing can be seen at all. Moreover, they re formed of many pieces which ought to be constructed with the greatest precision, and which render the instruments costly, inconvenient, and difficult to handle. It was a matter of necessity to adapt oneself to these defective conditions whilst there was nothing better, but it was exceedingly desirable to simplify and to improve them, in order to diffuse their use among those who have not great means at their disposal.

The spectrometer which we are about to describe corresponds, we hope, to these requirements. It consists simply of one of Amici's prisms, in which the deviation is nil, such as is found in Hoffmann's small spectrometers, and of an achromatic cylindrical lens. The lens is placed in front of and near to the ocular at a sufficient distance, because when placed there only the image of the star is reduced to a luminous thread. Our lens is about three inches focal length. Beyond the cylindrical lens is placed the above-mentioned prism, in such a position that it gives the dispersion of the spectrum perpendicular to the luminous focal line of the star.

The ocular for examining the spectrum is that of the telescope, and may be positive or negative; and by augmenting the magnifying power the amount of separation desired can be obtained. The ordinary filar micrometer may be applied, or, what is better, one furnished with two sharp points, which can be moved succes

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