[time-nuts] French Time offset

M. Warner Losh imp at bsdimp.com
Wed Mar 18 14:36:38 EDT 2009


In message: <ECE7A93BD093E1439C20020FBE87C47FEB5F69C083 at ALTPHYEMBEVSP20.RES.AD.JPL>
            "Lux, James P" <james.p.lux at jpl.nasa.gov> writes:
: > -----Original Message-----
: > From: time-nuts-bounces at febo.com 
: > [mailto:time-nuts-bounces at febo.com] On Behalf Of Jean-Louis Oneto
: > Sent: Wednesday, March 18, 2009 10:14 AM
: > To: Discussion of precise time and frequency measurement
: > Subject: Re: [time-nuts] French Time offset
: > 
: > BIPM is an _international_ organisation, and apart to be in 
: > France, has nothing to do (and never had as far as I know) 
: > with the definition of French legal time. At least no more 
: > than for any other country UTC (or TAI) based.
: > Jean-Louis
: > >
: > > Paris is at 2degrees 20 min longitude, which isn't enough 
: > to account 
: > > for
: > > 12.5 minutes.  Sevres (where BIPM is) is actually a bit to 
: > the west, 
: > > so even less solar time difference.
: 
: 
: Just casting about for potential meridian locations that might
: explain the 12.5 minute difference. Maybe the central longitude of
: France is 12.5 minutes(of time, 3 1/8th degrees of longitude) from
: Greenwich? (like India's time zone being on the half hour). Things
: get done for funny reasons: After all, the physical size of France
: is why ATM "cells" (packets) are 53 bytes (48 byte payload) instead
: of either 32 byte or 64 byte payloads.

Actually, there this paper:

http://www.ucolick.org/~sla/leapsecs/seago.pdf

says that the delta was 9 minutes and 20 seconds (see page 10)
Historic Universal Time (GMT) in France.

Warner




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