or present - into its position in the seasonal year if, for any reason, such information is desired. And this is true on any world, where conversion to and from the local days is also as easily possible. And, of course, Partner Elijah, any robot can do the same and can guide human activity where the seasonal year or local time is relevant. The advantage of metricized units is that it supplies humanity with a unified chronometry that involves little more than decimal point shifts."
It bothered Baley that the books he viewed made none of this clear. But then, - from his own knowledge of Earth's history, he knew that, at one time, the lunar month had been the key to the calendar and that there had come a time when, for ease, of chronometry, the lunar month came to be ignored and was never missed. Yet if he had given books on Earth to some stranger, that stranger would have very likely found no mention of the lunar month or any historical change in calendars. Dates would have been given without explanation.
What else would be given without explanation?
How far could he rely, then, on the knowledge he was gaining? He would have to ask questions constantly, take nothing for granted.
There would be so many opportunities to miss the obvious, so many chances to misunderstand, so many ways of taking the wrong path.
11
Aurora filled his vision now when he used the astrosimulator and it looked like Earth. (Baley had never seen Earth in the same way, but there had been photographs in astronomy texts and he had seen those.)
Well, what Baley saw on Aurora were the same cloud patterns, the same glimpse of desert areas, the same large stretches of day and night, the same pattern of twinkling light in the expanse of the night hemisphere as the photographs showed on Earth's globe.
Baley watched raptly and thought: What if, for some reason, he had been taken into space, told he was being brought to Aurora, and was in reality being returned to Earth for some reason - for some subtle and insane reason. How could he tell the difference before landing?
Was there reason to be suspicious? Daneel had carefully told him that the constellations were the same in the sky of both planets, but wouldn't that be naturally so for planets circling neighboring stars? The gross appearance of both planets from space was identical, but wouldn't that be expected if both were habitable and comfortably suited to human life?
Was there any reason, to suppose such a farfetched deception would be played upon him? What purpose would it serve? And yet why shouldn't it be made to appear farfetched and useless? If there were an obvious reason to do such a thing, he would have seen through it at once.
Would Daneel be party to such a conspiracy? Surely not, if he were a human being. But he was only a robot; might there not be a way to order him to behave appropriately?
There was no way of coming to a decision. Baley found himself watching for glimpses of continental outlines that he could recognize as Earthly or as non-Earthly. That would be the telling test - except that it didn't work.
The glimpses that came and went hazily through the clouds were of no use to him. He was not sufficiently knowledgeable about Earth's geography. What he really knew of Earth were its underground Cities, its caves of steel.
The bits of coastline he saw were unfamiliar to him - whether Aurora or Earth, he did not know.
Why this uncertainty, anyway? When he had gone to Solaria, he had never doubted his destination; he had never suspected that they might be bringing him back to Earth. - Ah, but then he had gone on a clear-cut mission in which there was reasonable chance for success. Now he felt there was no chance at all.
Perhaps it was, then, that he wanted to be returned to Earth and was building a false conspiracy in his mind so that he could imagine it possible.
The uncertainty in his mind had come to have a life of its own. He couldn't let go. He found himself watching Aurora with an almost mad intensity, unable to come back to the cabin reality.
Aurora was moving, turning slowly.
He had watched long enough to see that. While he had been viewing space, everything had seemed motionless, like a painted backdrop, a silent and static pattern, of dots of light, with, later on,