 How is time experienced by the people on the moon?
The meteor, a pebble, a little larger than a match head, traveled through space and time since it came into being. The light from the star that died when the meteor was created fell on Earth before the first lungfish ventured from the sea. In its last instant, the meteor fell on the Moon. Portions of the turbine also volitized; idling at eight thousand RPM, it became unstable. 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. Evans was about three hundred miles east of Williamson Town, the site of the first landing on the Moon. His drinking water—kept separate from the water in the reactor—might conceivably last just as long. But his oxygen was too carefully measured; there was a four-day reserve. Four days reserve—plus one is five—plus sixteen days normal supply equals twenty-one days to live. In seventeen days he might be missed, but in seventeen days it would be dark again, and the search for him, if it ever began, could not begin for thirteen more days. By the light of this, he reinspected the steam system, and found about three gallons of water frozen in the condenser. When the meteor pierced the turbine, the water in the condenser began to boil. This boiling lowered the temperature, and the condenser demonstrated its efficiency by quickly freezing the water in the tank. If there was any water in the boiler, it would operate the engine that drove the generator. Then, if the pump wasn't blocked by ice, it would return the water to the boiler. Carefully he poured a cup of his drinking water into a pipe that led to the boiler, and resealed the pipe. It was three days' supply of water, if it had been carefully used. It was one day's supply if used wastefully. It was ostentatious luxury for a man with a month's supply of water and twenty-one days to live. The stars next to the sun shone as brightly as though there were no sun. They might have appeared to waver slightly, if they were behind outflung corona flares. This was to allow the air-conditioning system to function properly, and to prevent air loss in case of the highly improbable meteor damage.
 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