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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
1. Today is the 6th anniversary of my sister's wedding. During this still-happy marriage she bore two children, who are now young adults.
2. Has anybody checked lately, on the plotting by telecom and data networking companies to abolish leap seconds? They want civil (legal) time to follow atomic clocks instead of the Earth's rotation. IMHO that's selfish and short-sighted. If they want the convenience of a uniform and predictable calendar+clock for their operating software, why not adopt one of the established linear time scales like GPS time, or TAI. The slow and irregular divergence of system time from civil time (such as UTC) should be manageable. For example, today's GPS receivers get GPS time and a correction for accumulated leap-seconds (presently about 15).
If we abolish leap seconds, GPS will be screwed up, atomic clocks will be screwed up, and tons of other things will be screwed up too. Also tell them Happy Anniversary!
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
If we abolish leap seconds most people won't know- even fewer will care. The only effect will be that legal time slips slowly and erratically with respect to astronomical time. Do you know anyone who sets their watch by the position of the distant stars? GPS will continue to work just fine and atomic clocks will be easier to use and set up because you won't have to add or subtract a second from the readout from time to time.
BTW, yesterday was also the 20th birthday of a college mate of my dad's.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Well, I've always wanted to build EOT-compensating sundials accurate enough to set one's watch by. And hope they'll still be accurate a century from now. Glad to report recent news that the leap-second system just got a 3-year reprieve.
Here's why I said abolishment is short-sighted. The slip rate is slow today, but is getting progressively worse. An Earth day is not only longer than 86400 SI seconds now, it's getting progressively longer. (Earth kept proper SI time around 1900). Seriously ... about 2 centuries from now, sunrise and sunset would happen 5 minutes later than today's reference books. As soon as 4 centuries after that, they would be 1/2 hour late.
The clever ITU has plans for that! Many countries mandate that civil time be locked to day and night, but don't specify the tolerable error (presently kept below +/- 0.9 seconds using leap seconds). ITU proposes that UTC would be allowed to deviate up to 1800 seconds, and then we'll have a leap hour! Instead of generations of citizens and network engineers getting used to more frequent leap seconds, there will be long-deferred anxiety about the Y2.6K bug.
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Leap day stuff
funny how that works out
