Occultations of Fixed Stars by the Moon.

The following are the most remarkable occultations that will occur this month'

✓ Virginis

Immersion.

Days. Hrs. Min.

Emersion.
Days. Hrs. Min.

.. 20 8 6 ... 20 9 7

13 Virginis.. 22 7 10

s Sagittarii

... 22 8 3

PHENOMENA PLANETARUM.

Mercury.

9d 5h. 16 m. descending node. 10 d. 21 h. 43 m. stationary. 19 d. 8 h. 31 m. in aphelion. 21 d. semidiameter 4'15. 25d. 6 h. 30 m. greatest western elongation (27° 6.)

Venus.

1st day, semi-diameter 4".82. 20th day, in conjunction with o Arietis; difference of latitude, 9'. 23 d. 4 h. 8 m. with Jupiter; difference of declination 33'.

2d day in conjunction with 54 Aquarii; difference of latitude, 7. 4th day, with o Aquarii; difference of latitude, 3. 11 d. 10 h. with › Aquarii. 16th day, with 1 h. Aquarii; difference of latitude, 21'. Aquarii; difference of latitude, 18'.

19th day, with o

21st day, semi

diameter, 2".40. 25th day, greatest south latitude...

1st day, semi-diameter, 15".98. 7th day, in conjunction with o Arietis; difference of latitude, 17. 14th day, with o Arietis; difference of latitude, 26'.

Eclipses of the Satellites.

The following is the only eclipse that will be visible :

Day. Hrs. Min. Sec.

First satellite. Emersion

....

1 7 52 54.2

REMARKABLE CONFIGURATIONS OF THE
SATELLITES, at 7 h. 40 m. in the Evening.

1st day, the first satellite in the shadow. 2d day, the second satellite in the shadow. 8th day, the first and fourth in the shadow.

The satellites of Jupiter are not visible from the 10th of this month until the 7th of June, from the proximity of the planet to the sun.

Saturn.

1st day, semi-diameter 10".34.

FORM OF SATURN'S RING.

1st April. Major axis of the ring.... 44".78

Minor axis....

Uranus.

1st day, semi-diameter 1".80.

+ 5.37

SPHERE OF THE FIXED STARS.

Positions of the principal stars on the 20th of the month, at 9 in the Evening.

North-east quarter of the Heavens.-Alderamin N. by E. altitude 24°. Arided N. N. E. altitude 10°. Lyra N. E. altitude 16°. B. Draconis N. E. altitude 33°. Rastaban N. E. altitude 30°. a Draconis N. E. altitude 62°. Cerberus E. N. E. & N. altitude 7. Ras

Algothi E. by N. altitude 9°. Alphecca E. & N. altitude 33°. Marsic E. altitude 224°.

South-east Quarter.-Cor Caroli E. by S. S. altitude 66°. Arcturus E. S. E. altitude 40°.

a Serpentis E. by E. altitude 17°. B Libræ E. S. E. altitude 8°. E.S. a Libræ S. E. by E. altitude 5o. Coma Berenices S.E. altitude 60°. Spica Virginis S. E. I S. altitude 21°. Denebola S.S.E. altitude 53°. Corvus S. S. E. altitude 20°. Crater S. by E. altitude 25°.

South-west Quarter.-Regulus S. S. W. altitude 50°. Cor Hydræ S. S. W. altitude 27°. a Cancri, altitude 43. Præsepe S. W. W. altitude 50°. Sirius S. W. by W. altitude 3°. Procyon S. W. by W. altitude 28°. Pollux W. by S. & S. altitude 47°. Castor W. by S. ¿W. altitude 48°. Betelgeux W. by S. W. altitude 14°. North-west Quarter.-Herschel's Telescope W. by W. altitude 45°. Lynx N. W. W. altitude 55°. Capella W. N. W. N. altitude 35°. Aldebaran W. by Musca Borealis N. W. altitude 3°. Triangula N. W. N. altitude 5o. Medusa's Head (Algol) N. W. altitude 16°. Almaach N. W. by N. altitude 103. Schedir N. by W. altitude 18°.

N. altitude 8°.

TELESCOPIC OBJECTS.

VENUS.

There is reason to believe that some physical change has occurred, probably in the atmosphere of this planet, sufficient to prevent as distinct a view of its surface, as that obtained by Bianchini, Cassini, and others: the drawings illustrative of the telescopic appearance of