In the equatorial regions he is always vertical, and in the polar he is never higher than the horizon.

Therefore, there can be no change of seasons; according to the latitude, it is a perpetual winter, spring, summer, or autumn the whole year round.

This state of things is almost precisely similar to that which prevails in Jupiter, who also stands nearly upright in his orbit, the inclination of his axis being only about 3 deg..
But how to account for the _grooves_?
A very hard nut to crack.

They must certainly be a later formation than the craters and the rings, for they are often found breaking right through the circular ramparts.
Probably the latest of all lunar features, the results of the last geological epochs, they are due altogether to expansion or shrinkage acting on a large scale and brought about by the great forces of nature, operating after a manner altogether unknown on our earth.

Such at least was Barbican's idea.
"My friends," he quietly observed, "without meaning to put forward any pretentious claims to originality, but by simply turning to account some advantages that have never before befallen contemplative mortal eye, why not construct a little hypothesis of our own regarding the nature of these grooves and the causes that gave them birth?
Look at that great chasm just below us, somewhat to the right.