eight o’clock
It is not to be denied that Thomas Black had some grounds for his fears . It really seemed likely that observations would be impossible . At daybreak the horizon was shrouded in mists Heavy clouds were coming up from the south , and covering the very portion of the sky in which the eclipse was to take place . But doubtless the patron saint of astronomers had pity on poor Black , for towards eight o'clock a slight wind arose and swept the mists and clouds from the sky , leaving it bright and clear ! A cry of gratitude burst from the lips of the astronomer , and his heart beat high with newly-awakened hope . The sun shone brightly , and the moon , so soon to darken it , was as yet invisible in its glorious beams . Thomas Black 's instruments were already carefully placed on the promontory , and having pointed them towards the southern horizon , he awaited the event with calmness restored , and the coolness necessary for taking his observation .