 How do moon inhabitants tell the time of day?
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. The shaft tried to tie itself into a knot, and the blades, damaged and undamaged were spit through the casing. 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. Evans was due back at Williamson Town at about sunset, that is, in about sixteen days. 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 one had a tank and coils of tubing in the center of a curved reflector that was positioned to radiate the heat of the steam into the cold darkness of space. 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. 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 ostentatious luxury for a man with a month's supply of water and twenty-one days to live. They flickered as the boiler pressure began to fail, but the steam had melted some of the ice in the condenser, and the water pump began to function. 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. When Director McIlroy came into his office, he found it lighted by the rising sun. This was to allow the air-conditioning system to function properly, and to prevent air loss in case of the highly improbable meteor damage.
 Identifying the shadow line as it relates to Earth's continents
 Identifying the shadow line as it relates to Earth's continents  Identifying the shadow line as it relates to the moon's time zones  Identifying the shadow line as it relates to the moon's continents  Identifying the shadow line as it relates to the Earth's time zones