nanog mailing list archives
Re: F-ckin Leap Seconds, how do they work?
From: George Herbert <george.herbert () gmail com>
Date: Wed, 4 Jul 2012 16:14:10 -0700
On Jul 4, 2012, at 3:29 PM, Jason Hellenthal <jhellenthal () dataix net> wrote:
Yeah but what you don't understand is that manual navigation after a certain point of difference becomes inaccurate to a degree that is unacceptable by most military standards.
Manual navigation (sextant, etc) is dead. It's not taught for new pilots or mariners / navigators. A few hobbyists still learn that, but they can easily keep a solar-true time clock around if they wish. Maintaining any time standard for that purpose is not supported. It's no reason for the timekeepers, nothing we need to care about. The few navigation systems that look at the sun and stars have - and inherently need - better time reference than the allowed 0.9 sec before we leap. They already handle this internally. That 0.9 sec max error comes to up to about 400 meters for equitorial surface nav or 6500 for orbital objects (or suborbital - cough). Already unacceptable... George William Herbert Sent from my iPhone
Current thread:
- Re: F-ckin Leap Seconds, how do they work?, (continued)
- Re: F-ckin Leap Seconds, how do they work? Peter Lothberg (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Steven Bellovin (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Tony Finch (Jul 03)
- Re: F-ckin Leap Seconds, how do they work? Owen DeLong (Jul 03)
- Re: F-ckin Leap Seconds, how do they work? Brett Frankenberger (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? valdis . kletnieks (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? Brett Frankenberger (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? valdis . kletnieks (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? William Herrin (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? Jason Hellenthal (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? George Herbert (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? Jimmy Hess (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? Owen DeLong (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? joel jaeggli (Jul 04)
- Re: F-ckin Leap Seconds, how do they work? Vadim Antonov (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Dmitry Burkov (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Vadim Antonov (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Jared Mauch (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Nick Hilliard (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Henning Stener (Jul 05)
- Re: F-ckin Leap Seconds, how do they work? Jared Mauch (Jul 05)