Clifford D Simak
In the east the moon was rising, a full moon that lighted the landscape so that he could see every little clump of bushes, every grove of trees. And as he stood there, he realized with a sudden start that the moon was full again, that it was always full, it rose with the setting of the sun and set just before the sun came up, and it was always a great pumpkin of a moon, an eternal harvest moon shining on an eternal autumn world.
The realization that this was so all at once seemed shocking. How was it that he had never noticed this before? Certainly he had been here long enough, had watched the moon often enough to have noticed it. He had been here long enough — and how long had that been, a few weeks, a few months, a year? He found he did not know. He tried to figure back and there was no way to figure back. There were no temporal landmarks. Nothing ever happened to mark one day from the next. Time flowed so smoothly and so uneventfully that it might as well stand still.
Writers and Writing
Time and Time Management