Augustine of Hippo
Catena Aurea · Markusevangelium 16
And when the sabbath was past, Mary Magdalene, and Mary the mother of James, and Salome, had bought sweet spices, that they might come and anoint him. And very early in the morning the first day of the week, they came unto the sepulchre at the rising of the sun. And they said among themselves, Who shall roll us away the stone from the door of the sepulchre? And when they looked, they saw that the stone was rolled away: for it was very great. And entering into the sepulchre, they saw a young man sitting on the right side, clothed in a long white garment; and they were affrighted. And he saith unto them, Be not affrighted: Ye seek Jesus of Nazareth, which was crucified: he is risen; he is not here: behold the place where they laid him. But go your way, tell his disciples and Peter that he goeth before you into Galilee: there shall ye see him, as he said unto you. And they went out quickly, and fled from the sepulchre; for they trembled and were amazed: neither said they any thing to any man; for they were afraid.
(Con. Evang. iii. 24) What Luke expresses by very early in the morning, and John by early when it was yet dark, Mark must be understood to mean, when he says, very early in the morning, at the rising of the sun, that is, when the sky was growing bright in the east, as is usual in places near the rising sun; for this is the light which we call the dawning. Therefore there is no discrepancy with the report which says, while it was yet dark. For when the day is dawning, the remains of darkness lessen in proportion as the light grows brighter; and we must not take the words very early in the morning, at the rising of the sun, to mean that the sun himself was seen upon the earth, but as expressing the near approach of the sun into those parts, that is, when his rising begins to light up the sky.