This moving fleck sin spanking was a satellite, and in a moment, motionless, uninstrumented sin spanking but for his chronometer and his part-brain, sin spanking he will know which one. (He is grateful beyond expression-without that sliding chip of light, there were only those footprints, those wandering footprints, to tell a man he was not alone in the world.)
Say you were a kid, eager and challengeable and more than a sin spanking little bright, sin spanking you might in a day or so work out a way to measui~e the period of a satellite with nothing but a timepiece and a brain; you might eventually see that the shadow in the rocks ahead had been there from the first only because of sin spanking the light from the rising satellite. Now if you check the time sin spanking exactly at the moment when the shadow on the sand is equal to the height of the outcrop, and time it
again when the light is at the zenith and the shadow gone, you sin spanking will multiply this number of minutes by 8-think why, now: horizon to zenith is one-fourth
of the orbit, give or take sin spanking a little, and halfway up the sky is sin spanking half that quarter- and you will then know this satellite's period. You know all the periods-ninety minutes, two, two-and-a-half hours; with that and the appearance of sin spanking this bird, you'll find out which one it is.
But if you were that kid, eager or resourceful or whatever, you wouldn't jabber about it to sin spanking the sick man, for not only does he not want to sin spanking be bothered with sin spanking you, he's sin spanking thought of all that