Corrected comments to calendar-julianday-from-proleptic-gregorian
and cond for year 1582.
File requires calendar.el

Nick

On Fri, May 22, 2015 at 8:36 AM, Nicholas Strauss
<nicholas.strauss@gmail.com> wrote:
> There are other day number systems more common than the  emacs
> "absolute" day number --
> the "astro" or Julian day number and the proleptic Gregorian system
> used by sqlite3
> e.g. select julianday("-4713-11-24").
> cal-julian.el:alendar-astro-to-absolute refers to  "astro".
> Proleptic Gregorian day 0 = November 24, 4714 BC while "astro" day 0 =
>  January 1, 4713 BC.
> I'm attaching julian.lisp which has calendar-correlate-from-date and
> calendar-correlate-from-julianday
> may help with days before 1582. These are based on Peter
> Duffett-Smiths calculations.