Mercury is too near the sun to be well observed, setting at the beginning of the month about half-an-hour after the sun, the interval decreasing.

Venus sets about an hour after sunset throughout the month.

Mars rises about 40 minutes after sunset on the 1st, the interval decreasing. From the middle of the month he rises before sunset. He is at opposition to the sun on the 5th.

Jupiter may be observed till an hour before midnight, the interval increasing, setting about 9 p.m. on the last day. He is at quadrature with the sun on the 17th.

Saturn may be observed soon after sunset on the Ist. He then rises earlier each day. He will be at opposition to the sun on the 9th.

EPHEMERIS FOR PHYSICAL OBSERVATIONS OF

On Sept. 22, the day of full moon, and perhaps already in the preceding night, the flattenings or depressions alluded to on page 200, will come into view. They will be fully visible and observable in the following lunation, on Oct. 19, 20, 21.

A. M.

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