[12] Carrington found that spots near the equator gave a shorter rotation-period than those far removed from it. This offers an analogy to the spots on Jupiter, which move with greater celerity near the equator, though the rule is not absolute.
[13] In 1852 Dawes observed and measured a rotatory motion affecting a spot at the rate of about 17° per day.
[14] Lalande, in 1778, asserted that “there are spots of very considerable magnitude, which, reappear in the same physical points of the solar disk.”
[15] A spot was visible on June 30, 1889, in 40° South latitude. Its recorded duration was 2 days. This object was observed at the Stonyhurst Observatory and at a station in North America.
[16] In September 1889 Prof. Thury, of Geneva, reported a change in the centre of the crater Plinius. With a 6-inch refractor he saw, instead of the usual two hills in the interior, a circular chalk-like disk “with a dark spot in its centre like the orifice of a mud-volcano.”
An extensive walled plain, 110 miles in length.
[18] The objects for observation when the Moon’s age is from 2 to 4 days may be suitably re-examined a few days after the full.
[19] A large walled plain containing a small crater, Cleomedes A.
[20] A curious double crater, with comet-like rays crossing the Mare Fœcunditatis.