[time-nuts] Tuning a Thunderbolt

Oooh, very nice, the full monty of tuning goodness!After doing all that you can spend countless hours tweaking things in search of maximum time-nut-goodness... I'm not sure that a 96 hour precision survey is measurably better than 48 hours, but what the heck, might as well go for it.

Re: [time-nuts] Ublox Neo M8T no output on TP2 question please?

David, Don't tap the time LEDs. For InCase series NEO-M8T TIME & RAW receiver board (https://www.csgshop.com/product.php?id_product=218), access to PPS is through the 12 pin JST SH socket, its harness or the breakout board it feeds. You can see the breakout board's labelled items at

[time-nuts] leapseconds, converting between GPS time (week, second) and UTC

Martin Burnicki wrote: > Agreed, but that's simply wrong. If you ran a PTP daemon instead of an > NTP daemon you had exactly the same problems when the PTP daemon passes > a leap second announcement to the kernel. PTP never does that.  IEEE-1588 has a different epoch but is based on TAI, which

Re: [time-nuts] Calculating sidereal time

On Sat 2019-01-19T12:15:28-0800 Steve Allen hath writ: > The most expedient place to find them are roughly pages B7 to B12 in a > current Astronomical Almanac. See for example > https://babel.hathitrust.org/cgi/pt?id=uc1.31822038913307;view=1up;seq=116 Emphasizing one point, it has always been

Re: [time-nuts] Calculating sidereal time

Replying to my own email as I understand my mistake... Of course the leap seconds must be applied. The whole point of the leap seconds is for UTC to be consistent with the actual position of the earth in the sky, so to get accurate mjd, I have to use UTC. On Sat, Jan 19, 2019 at 11:33 AM Didier

Re: [time-nuts] Ublox Neo M8T no output on TP2 question please?

Hi This has swung over to the “is it legit” / supported question. What’s below is *only* in reference to that part: There are various levels of “legit” when it comes to these modules. Some are 100% uBlox produced units with flash code. Some are equally 100% uBlox, but have the firmware in

Re: [time-nuts] Ublox Neo M8T no output on TP2 question, please?

Hi Chris, By query I meant poll settings, sorry. Your screenshot shows 1MHz configured on TIMEPULSE 2. I don't think it is going to work. Standard products used to have 1kHz frequency limit on TIMEPULSE 2. I have not checked any FTS functionality recently. The manual (Receiver Description)

Re: [time-nuts] Calculating sidereal time

On Fri, Jan 18, 2019 at 11:00 PM Steve Allen wrote: > > This expression is no longer in use. It was superseded Capitaine et al. > > http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2003A%26A...406.1135C > in which formalism it is explicitly disavowed that earth rotation is time. > >

Re: [time-nuts] Calculating sidereal time

Hi Steve, Thanks a lot for the references and background information. Looks like I have more reading to do... I was not planning to for this project but it is interesting. I have seen references to using half days in some code samples. I suppose this is what Brooke referred to when he said

[time-nuts] Calculating sidereal time

When I was playing with the sidereal time code I found lots of buggy/bogus implementations and also lots of web calculators that were either totally wrong or off by some amount.Same for sunrise/sunset code and equation-of-time code. It's hard to know what code / sites you can trust.