south
latitude and 20 deg. east longitude. Northeast from this lay _Oceanus
Procellarum_, the Ocean of Tempests, the most extensive of all the
plains on the lunar disc, embracing a surface of about half a million of
square miles, its centre being in 10 deg. north and 45 deg. east. From its bosom
those wonderful mountains _Kepler_ and _Aristarchus_ lifted their vast
ramparts glittering with innumerable streaks radiating in all
directions.
To the north, in the direction of _Mare Frigoris_, extends _Mare
Imbrium_, the Sea of Rains, its central point in 35 deg. north and 20 deg.
east. It is somewhat circular in shape, and it covers a space of about
300 thousand square miles. South of _Oceanus Procellarum_ and separated
from _Mare Nubium_ by a goodly number of ring mountains, lies the little
basin of _Mare Humorum_, the Sea of Humors, containing only about 66
thousand square miles, its central point having a latitude of 25 deg. south
and a longitude of 40 deg. east.
On the shores of these great seas three "Gulfs" are easily found: _Sinus
Aestuum_, the Gulf of the Tides, northeast of the centre; _Sinus
Iridium_, the Gulf of the Rainbows, northeast of the _Mare Imbrium_; and
_Sinus Roris_, the Dewy Gulf, a little further northeast.
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