In the Manhattan project plutonium was copper, and copper was honest-to-god copper.
In the Java JSR-310 "Date and Time API" https://jsr-310.dev.java.net/userguide.html we see this: Time scales The Instant class operates on a time-line model that doesn't exist in reality. Specifically it assumes that leap-seconds do not exist, and that there are always 60 seconds in a minute. These simplifications are useful because most applications do not take into account the existence of leap seconds. If your application needs to takeinto account leap seconds then an alternate class is needed. The TimeScaleInstant class represents an instant in time measured againsta specific TimeScale. The supplied scales include TAI and True-UTC. "True-UTC", as opposed to just plain "UTC". Just plain "UTC" is not the entity defined by ITU-R TF.460, but a (dare I use the word) proliferated time scale, something new created by them. How long will it be before it is necessary to make the distinction between "TAI" in JSR-310 and "True-TAI" as defined by BIPM? I think I would call this not "proliferation" but "dilution of trademark". Who is in charge of these time scales? The defining agencies and their documents, or various different sets of time scale users and their documents? -- Steve Allen <s...@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855 University of California Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
