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A Table showing the Illuminated Portions of the Discs of Venus and Mars.

The numbers in this table are the versed sines of that portion of the discs which, to an observer on the Earth, will appear to be illuminated, the apparent diameters of the planets at the time being considered as unity.

To a spectator on the Earth, Venus appears most brilliant when her elongation is about 45°, and she is approaching her inferior conjunction, or receding from it; in 1855 in August and November. Mars is most brilliant about the time of his opposition to the Sun, being then also nearest to the Earth ; in which position he will not be this year.

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Visible in the United States between Sunset and Sunrise, Mean Time, Wash

ington Observatory (Astronomical account).

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Position and Magnitude of the Rings of Saturn, according to Bessel and

Strude, for every Fortieth Day in ihe Year, at 7 hours in the Morning,

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7h. M. 1855, January 1 45'92 |- 20.27 $

233 -115-4,31A
February 10 43.22 19.12 4 133 2014.3 2373
March 22 40.20 17.95 4 272 26 31 2 24, 420)
May

1 38.11 17.20 4 53.7 26 496
June 10 37.38 16.93 5 23 2563
July
20 33.07 17.14

21 461 493 August 29 40.09 17.-5

6 210: 27
October
43.07 19.04

20 13.3
November 17 45.36 20.34 6 24.0
December 27 ! 46 65

20.93

67.9 24, 303

46:35 2.91 a denotes the outer semi-tradererse alis of the outer ring, b

outer seni-conjugale az ve of the outer riog priuex whats the

Dortbern surface is risivie, lagalive wissu tha, boutine, p denotes the inclination of the Durlueru stw Us jugak uzun vf this summe

to the circle of decimation, as we Lusi, 2

4 angle of eleration of tut farti ainst thu piawa; of tiu ruke,

as seen from Daturni mueu furtit. I''

angie of elerative of the bui atsura tu piaws. ut tia , *

sten froil Saturl ; - V11 Monit, The inner semi-transverst az utut 1164 2:15 i wn tunda of you minished by 0.60. Tu niti sinovijugant sie uf tim, issus susp. 1.4 thirds of i

LATITUDE AND LONGITUDŁ 05 *!** PLIM111, FX1N

1 . Torude art from )

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Position and Magnitude of the Rings of Saturn, according to Bessel and

Strude, for every Forlieth Day in the Year, at 7 hours in the Morning.

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7h. M. 1855, January 1 45.92

-20 27 Å 23.3 -26 11.5 -26 31.4 February 10 43.22 19.12 4 13.3 26 14.9 26 37.3 March 22 40.20 17.95 4 25.2 26 31.2 26 42.0 May 1 38.11 17.20 4 53.7 26 49 6 26 45.6 June 10 37.38 16.93 5 28.3 26 56.3 26 48.0 July

20 38.07 17.14 5 59.5 26 46.1 26 49.3 August 29 40.09 17.85 6 21.0 26 267 26 49.3 October

43.07 19.04 6 29.5 26 13.9 26 48.0 November 17 45.86 20.34 6 24.0 26 20.0 26 45.6 December 27 46.65 20.93 6 7.9 26 39.3 26 42.0

32 46.55 20.91 6 5.5 26 41.7 26 41.6 a denotes the outer semi-transverse axis of the outer ring. b

u outer semi-conjugate axis of the outer ring, positive when the

northern surface is visible, negative when the southern. p denotes the inclination of the northern semi-conjugate axes of the rings

to the circle of declination; + when East, when West. 1

“ angle of elevation of the Earth above the plane of the rings,

as seen from Saturn; + when North, when South. l'

“ angle of elevation of the Sun above the plane of the rings, as

seen from Saturn; + when North, when South. The inner semi-transverse axis of the inner ring is two thirds of a, diminished by 01.07. The inner semi-conjugate axis of the inner ring is two thirds of b.

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LATITUDE AND LONGITUDE OF THE PRINCIPAL FOREIGN

OBSERVATORIES.
[The Longitudes are from Greenwich.)

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