 How is time experienced by the people on the moon?
It was two days to sunrise, where Evans stood. 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 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.
 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