[LEAPSECS] Common Calendar Time (CCT) -Brooks Harris

[Tony Finch]

Zefram <zefram at fysh.org> wrote:

>

> You show your "Earth Correction" being a constant 10 s prior to

> 1972, and following the TAI-UTC difference thereafter.  This makes a

> poor correction.  If the intent is to define a proleptic version of

> modern UTC, you need to decide on dates for proleptic leap seconds.


For instance, http://fanf.livejournal.com/69586.html


> >I'll suggestion a name for this scale - "Local Time Offset (LTO)".

>

> Decent name, and it can be fairly applied to the offsets that we already

> manage, independent of the CCT concept.


I'm slightly surprised that there doesn't seem to be a convenional terse
phrase for this already - ISO 8601 just uses circumlocutions like
"difference between local time and UTC of day".


> >Local Time Offset declares 104 offsets from CCT on 15 minute

> >increments from CCT-12:00 to CCT+14:00.

>

> You will not in practice succeed in dictating a limit to either the

> range or the resolution of local time offsets.  Each locality decides

> its time for itself; there is no authority that can dictate otherwise.


15 minute intervals are not fine-grained enough for historical zones that
followed local mean solar time. The range of offsets has been surprisingly
large in the past, e.g. the Philippines / Manila on -15:56 until 1844
after which they crossed the date line and switched to +08:04.

Tony.
-- 
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