 How is time experienced by the people on the moon?
It was two days to sunrise, where Evans stood. It was just before sunset on a spring evening in September in Sydney. The shadow line between day and night could be seen from the Moon to be drifting across Australia. Evans, who had no watch, thought of the time as a quarter after Australia. Four days reserve—plus one is five—plus sixteen days normal supply equals twenty-one days to live. It was three days' supply of water, if it had been carefully used. It was ostentatious luxury for a man with a month's supply of water and twenty-one days to live. This was to allow the air-conditioning system to function properly, and to prevent air loss in case of the highly improbable meteor damage. For example, because of an order of his stating that there would be no alcoholic beverages within the survey building, the entire survey was assured of a constant supply of home-made, but passably good liquor. Morning to Mrs. Garth was simply the first four hours after waking. Morning to him had no meaning at all, but he thought in the strictest sense that it would be morning on the Moon for another week. The solar furnace was a rough parabola of mirrors used to focus the sun's heat on anything that it was desirable to heat. It was used mostly, from sun-up to sun-down, to supplement the nuclear power plant. Three of the nine banks of mirrors would not respond to the electric controls, and one bank moved so jerkily that it could not be focused, and it threatened to tear several of the mirrors loose. Nearly all of these had been made millions of years ago, but here and there, the rim of a crater covered part of a footprint, clear evidence that it was a recent one. All of these needed water to form, and their existence on the Moon puzzled him for a while. The sun rose to the meridian slowly. For a while Earth was a dark disk in a thin halo, and then the light came to be a crescent, and the line of dawn began to move around Earth. The continents drifted across the dark disk and into the crescent. The people on Earth saw the full moon set about the same time that the sun rose. He made trips from and to the Moon about once a month, carrying supplies in and metal and ores out. That's from here to Earth, of course.
 They track time based on both Earth and the moon
 They track time based on both Earth and the moon  They work in two-week shifts, built around supply runs  They all live and work on an Earth schedule  They plan their schedules around the water cycle