eastward every year, and, being in conjunction with Jupiter in Sagittarius in 1901, does not get beyond the border of that constellation in 1902.
Jupiter having been in opposition to the sun June 30, 1901, will be similarly placed early in August, 1902, the time from one opposition of Jupiter to the next being 399 days.
Saturn passes from one opposition to the next in 378 days, so that having been in that position July 5, 1901, it reaches it again about July 18, 1902.
Mars requires about 687 days to complete a revolution, and comes into conjunction with the earth, or opposition to the sun--the best position for observation--on the average once every 780 days.

Mars was in opposition near the end of February, 1901, and some of its future oppositions will be in March, 1903; May, 1905; July, 1907; and September, 1909.

The oppositions of 1907 and 1909 will be unusually favorable ones, for they will occur when the planet is comparatively near the earth.

When a planet is in opposition to the sun it is on the meridian, the north and south line, at midnight.
Mercury and Venus being nearer the sun than the earth is, can never be seen very far from the place of the sun itself.

Venus recedes much farther from the solar orb than Mercury does, but both are visible only in the sunset or the sunrise sky.