[LEAPSECS] nails in the coffin of mean solar time

Rob Seaman seaman at noao.edu
Sat Jun 16 20:00:19 EDT 2007

On Jun 16, 2007, at 3:46 PM, M. Warner Losh wrote:

> A simple work around is to move time zones over one every few hundred

> years. That's a lot easier than getting leap seconds right as most

> places do DSL. A single year without a DSL transition would suffice.

> And each nation could choose the year they do it too, as there's

> really no need to coordinate.

There IS a need to coordinate - but even a coordinated dance of the
timezones won't work, as three out of four Norwegian Fjord Ponies
will tell you:


UTC is both a flavor of universal time - that is, an approximation to
GMT - as well as an report format for TAI. Even during a leap
second, UTC preserves a single, monotonic record of events worldwide.

Per-timezone daylight saving adjustments are possible precisely
because the underlying unity of timekeeping is preserved elsewhere.
What you describe would be a return to pre-universal time chaos.

Rob Seaman

More information about the LEAPSECS mailing list