[LEAPSECS] Time math libraries, UTC to TAI

[Richard Langley]

And more here:
http://www.hermetic.ch/cal_stud/jdn.htm

-- Richard Langley

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| Richard B. Langley                            E-mail: lang at unb.ca         |
| Geodetic Research Laboratory                  Web: http://gge.unb.ca/     |
| Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
| University of New Brunswick                   Fax:      +1 506 453-4943   |
| Fredericton, N.B., Canada  E3B 5A3                                        |
|        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |
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> On Jan 2, 2017, at 4:19 PM, Pierpaolo Bernardi <olopierpa at gmail.com> wrote:
> 
> On Mon, Jan 2, 2017 at 9:10 PM, Clive D.W. Feather <clive at davros.org> wrote:
>> Michael.Deckers. via LEAPSECS said:
>>>    It is the Julian day numbers used in astronomy that
>>>    take integral values at noon epochs -- but they have nothing to do with
>>>    the Julian calendar, except perhaps for the origin of the name.
>> 
>> Not even that - I thought Julian days were named after
>> some astronomer or other.
> 
> I thought the same. But the current English Wikipedia page about
> Julian days says otherwise, and actually the Julius of Julian days is
> the same Julius of the calendar.
> 
> https://en.wikipedia.org/wiki/Julian_day#History
> 
> "Although many references say that the Julian in "Julian Period"
> refers to Scaliger's father, Julius Scaliger, in the introduction to
> Book V of his Opus de Emendatione Temporum ("Work on the Emendation of
> Time") he states, "Iulianum vocavimus: quia ad annum Iulianum dumtaxat
> accomodata est", which translates more or less as "We have called it
> Julian merely because it is accommodated to the Julian year." Thus
> Julian refers to Julius Caesar, who introduced the Julian calendar in
> 46 BC."
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