I looked at the watch on my wrist. Oh eight oh six, Greenwich Standard Time. The girl had been a little late in calling, but it didn't matter that much.

All over the Solar System, except on Earth itself, the clocks read the same as they do in Greenwich, England. Time zones don't mean anything anywhere except on Earth, where the natives feel that the sun should be at the zenith when the clock says twelve. An irrational concept, to say the least.

Well, not really. Let's say that it's an emotional concept. A man feels better if he has the comfortable notion that the position of the sun has something to do with the numbers on the clock. It gives him a sense of security. Only the fact that a man in the Belt—or anywhere else in the System, for that matter—is not dependent on Sol for lighting purposes makes it possible to establish a Standard Time for everyone.

Oddly enough, Greenwich Standard Time serves an emotional and religious purpose, too. It's only by the clock that a Jew can tell when the Sabbath begins; it's only by the clock a Catholic can tell when to begin his abstinence on Friday; it's only by the clock that a Moslem can tell when to begin and end the fasts of Ramadan.

And it is only by the clock that the various eight-hour work shifts can operate in the Belt. On Earth, the four-hour workday is standard, but there's a lot more work to be done in the Belt.

I got up and got dressed and took the tubeway to Viking Test Area Four, where McGuire was the ruler of the roost. The guard at the main door took one look at my pass, smiled me in, and headed for his phone as soon as I went inside. By the time I had arrived at the office of Chief Engineer Sven Midguard, the whole staff had been alerted, and the top men were waiting for me in Midguard's office.

Midguard himself met me in his outer office—a graying man in his sixties, still handsome in the telly-idol way, but running a bit to paunch now that he was approaching middle age.

"Mr. Oak! So glad to see you! So glad we could get you to help us."

"Happy to be of service," I said.

"Yes, yes, of course. Come along, come on in and meet the staff. They're ... uh ... anxious to meet you."