question:  How is time experienced by the people on the moon?
context: The meteor, a pebble, a little larger than a match head, traveled through space and time since it came into being. 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. 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. This boiling lowered the temperature, and the condenser demonstrated its efficiency by quickly freezing the water in the tank. 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.
output:  They track time based on both Earth and the moon
options:  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