PLANETARY PHENOMENA FOR OCTOBER, 788o. 349 
On the 1st at 9 h. 30 m. p. m., Io reappears after occultation. 
On the 5th at 11 h. 12 m. p. m., a small round black spot will appear on the 
eastern edge of the planet’s disk, it being the shadow of Ganymede, which satel- 
lite will follow in 18 minutes, and both will make a transit of the planet’s disk. 
On the 7th, at 11 h. 50 m. p. m., Io and its shadow will enter on the plan- 
et’s disk at the same time and pass across in transit. 
On the 8th at 11 h. 15 m. 27s., Io will suddenly reappear, coming out of 
Jupiter’s shadow, and will be very close to the eastern edge of the planet. 
On the oth at 7 h. 06 m. 22s. p. m., Europa reappears after being eclipsed. 
On the same day at 3h. 28 m. p. m., Io will pass off the western edge of 
‘the planets disk, followed in 5 minutes by its shadow. 
On the 14th at 11 h. 57 m. p. m., Europa will enter on the planet in transit, 
followed by its shadow in 23 minutes. 
On the 15th at ro h. 45 m. p. m., Io will disappear behind the planet’s 
disk. 
On the 16th at 7 h. 32 m. 07s. p. m., Ganymede will suddenly reappear at 
some distance to the east of the planet. 
@n the 17th at 7 h: 39 m. 26 s. p. m., To reappears to the east of the 
planet. ; 
On the 23d at 7 h. 26 m. p. m., Ganymede will disappear behind the west- 
ern edge of the planet, and at 8h. 45 m. p. m., Europa will likewise disappear 
and at 11 h. 33 m. 53s p. m., Ganymede will suddenly reappear at some distance 
from the planet on the east side. Europa will likewise reappear at 11 m. 50S. 
past midnight. 
On the 24th at 9 h. 34 m. 50s. p. m, Io will reappear after being eclipsed. 
On the 25th in the early evening two small round black spots may be seen 
near the western edge of Jupiter’s disk, and at 6 h. 51 m p. m., the one nearest 
to the edge will pass off followed by the other in 7 minutes. They are the 
shadows of Io and Europa. 
On the morning of the 31st at r h. ro m., Ganymede will reappear, coming 
from behind the planet and at 1 h. 16 m. 35 s., will plunge into Jupiter’s shadow 
and disappear, being visible a little more than 6 minutes. 
On the 31st at 8h. 50 m. p. m., Io will disappear by being occulted, and 
reappears from being eclipsed at 11 h. 30 m. 20s. p. m. 
Saturn rises as follows: On the 1st at6 h. 32 m. p m. On the 31st at 4 h. 
28m p. m., and for observation is favorably situated, being in opposition to the 
sun on the 18th at 6 h. a. m. 
This is one of the most remarkable planets in this solar system, being en- 
circled with a system of thin rings extending out in the plane of the planet’s 
equator to a distance of more than 83,000 miles from the planet’s center. On 
‘the 7th we are 14° 30’ above the plane of the southern surface of the rings, 
‘which elevation is slowly decreasing during the next two months, owing to the 
‘motion of the earth in its orbit. 
