ASTRONOMICAL NOTES. OBSERVATORY OF VASSAR COLLEGE. For the computations of the following notes (which are approximate only) and for most of the observations I am ndebted to students. M.M. Positions of Planets for April 1874. Mercury. This planet which was so beautiful in the evening twi ght in March rises in April before the sun and should be ooked for in the morning. Its declination is so much far her south than in March that it cannot be so well seen. On the 1st of April Mercury rises about 5 A. M. and sets at 4h. 31m. P. M. On the 30th Mercury rises at 4h. Venus. On the 1st of April Venus rises at 6h. 14m. A. M. and sets at 7h. 6m. P. M. On the 30th Venus rises at 5h. 49m. A. M. and sets at 8h. 19m. P. M. Venus should be seen after sunset almost directly in the un's path on the first half of the month ; after that date it will be further north than the sun and can be seen for some time after sunset. Venus and the moon will be in conjunc tion on the 17th. Mars. Mars will at present scarcely repay the observer who at tempts to study its phenomena even with the aid of a good telescope. On the 1st Mars rises at 6h. 51m. A. M. and sets at 8h. 35m.P.M. On the 30th Mars rises at 5h. 54m. A. M. and sets at 8h. 30m. P. M. Jupiter. On April 1 Jupiter rises at 4h. 50m. P. M. and sets at 5h. 14m. A. M. On the 30th it rises at 2h. 43m. P. M. and sets at 3b. 15m. the next morning. Jupiter is the great beauty of our evening skies all through the month. It should be observed between 9 P. M. and midnight when it is not far from meridian. Its motion among the stars is retrograde or toward the west and it is so great that from night to night its change of place can be detected. The phenomena resulting from the motions of the sat ellites on the 7th and 15th of the month are very interesting and some of them can be seen with a small telescope. On the 7th the fourth satellite will disappear by eclipse—it will pass into the shadow of Jupiter and before it comes out the first satellit
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