Javascript Ephemeris

Peter Hayes wrote:
Paul Schlyter wrote:
In article ,
Peter Hayes wrote:
Paul Schlyter wrote:
In article ,
Peter Hayes wrote:
For those who use or have copied my ephemeris pages I've made a
small correction so it gets daylight saving time right for those
states of the USA that use it. Most places change on the last
Sunday of the month but America decided to be different.

Pete H

http://www.aphayes.pwp.blueyonder.co...ris/index.html
Perhaps you could correct your ephemeris pages further, so that you
give RA and Decl to approximately the same accuracy? As your
Javascript
ephemeris is now, you give the declination some ten times more accurate
than the accuracy of the RA you give.

Yes, I know it's a common error - people seem to fail to realize that
one minute of time (in RA) is really the same as 15 minutes of arc.
Fixed, the code now prints minutes of RA as mm.m I've also added
references to your planetary web pages for the gravitational
perturbations between the outer planets. I'm not planning to add the
corrections any time soon but a least users know of the potential
errors.

Pete H

Great!

But you forgot the Moon - its RA is still displayed as hh:mm


OK tomorrow, some of this code is 5 years old and I'm in the over 60
memory failing zone ;(

Or even this evening. The good thing about learning programming from
Wirth is I've defined most of the code in small functions so it was a 1
character change to select the routine to print RA to the required
precision. All I need now is someone to go out and check the
calculations against the real sky ;( but I guess having the same
results as NOAA is near enough the same thing.


Pete H


Pete H