[Coco] Looking for CoCo astronomy and space software.

[Theodore Evans (Alex)]

On Jan 19, 2004, at 12:12 PM, Gene Heskett wrote:

> There was an solar or lunar eclipse predictor program published maybe
> 15 years ago in IIRC Byte, written in basic-5.22, whatever that was.
> It looked a lot like truebasic in styling.  I had  fun converting it
> to C srcs and making it run, but was never convinced it was 100%
> accurate.  It made heavy use of julian time, which with the south
> american fellows trig libraries from the rainbow, seemed to fall
> apart in March, 4714 BC IIRC.  I don't think julian time likes itself
> when it goes below zero...

I have seen too many programs over the years that fail to take into 
consideration that on our calendar 1 BC (753 AUC) is the year before 1 
AD (754 AUC) and as a result are a year off for everything before 1 AD. 
  Of course you can easily start to get into all kinds of special 
problems as you go back especially as the Julian calendar only goes 
back to c. 700 AUC (c. 50 BC).