The Cause Of ...

The astronomer royaL tor Scsouand states that when the moon is half full ita brilliancy is not nearly one-half as great as when it Í9 quite full. He attributes the brightness of the full moon to the bright streaks which are then seen over the lunar surface, starting froin the crátera. He supoosea these to bo oonvex or concave, and largely invisible under oros lights, and brillUntly illurainated when thí sun ahines full upoo thoin.