CLHS: Section 25.1.4.4

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## 25.1.4.4 Seconds

One function, sleep, takes its argument as a non-negative real number of seconds. Informally, it may be useful to think of this as a relative universal time, but it differs in one important way: universal times are always non-negative integers, whereas the argument to sleep can be any kind of non-negative real, in order to allow for the possibility of fractional seconds.

    sleep

Figure 25-8. Defined names involving time in Seconds.

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