about 4 a.m
In the meantime the bullet was describing in the darkness that incalculable trajectory which no landmark allowed them to find out . Was its direction altered either under the influence of lunar attraction or under the action of some unknown orb ? Barbicane could not tell . But a change had taken place in the relative position of the vehicle , and Barbicane became aware of it about 4 a.m. . The change consisted in this , that the bottom of the projectile was turned towards the surface of the moon , and kept itself perpendicular with its axis . The attraction or gravitation had caused this modification . The heaviest part of the bullet inclined towards the invisible disc exactly as if it had fallen towards it .