midnight
The selenographic maps make it the lower one , because they are generally drawn up according to the image given by the telescopes , and we know that they reverse the objects . Such was the _ Mappa Selenographica _ of Boeer and Moedler which Barbicane consulted . This northern hemisphere presented vast plains , relieved by isolated mountains . At midnight the moon was full . At that precise moment the travellers ought to have set foot upon her if the unlucky asteroid had not made them deviate from their direction . The orb was exactly in the condition rigorously determined by the Cambridge Observatory . She was mathematically at her perigee , and at the zenith of the twenty-eighth parallel .