Re: ITL library & kprayertime

[Thamer Mahmoud <neokuwait at myrealbox dot com>]

abdulhaq writes:
 > salaam
 > 
 > a few times harvested off the internet for 52.6432   -1.1.0333
 > 
 > http://www.marsbase.net/m/sunrise-sunset-marsrise-marsset.php 
 > 
 > 5:36 13:01 20:26 using VSOP87
 > 
 > http://www.yanabi.com/praytimes/
 > 
 > 5:35 13:03 20:29 using VSOP87 and Dhuhr/Maghrib has been adjusted so that the 
 > entire disc of the sun has moved off the noon/sunset position
 > 
 > ITL
 > 
 > 5:37 13:01 20:25
 > 
 > Abdali
 > 
 > 5:36 13:02 20:28
 > 
 > What I think is worth stressing is that shuruq must not be too late and 
 > maghrib must not be too early.
 > 
 > wassalaam
 > abdulhaq


Salaam,

I have taken another look at this. It seems that some of the
values/astronomical equations used were not accurate enough. I did
some testing last year but since the problem is more visible on leap
years, like this year, I did not notice this until now. This is now
fixed on CVS. Thanks for your excellent feedback.

Just to summarize your findings and to also add the fixed ITL results,
Here are the times again for 20040429:

5:35   13:01   20:28  libnova
5:35   13:03   20:29  yanabi.com
5:36   13:02   20:28  Abdali
5:36   13:01   20:26  marsbase.net
5:37   13:01   20:25  ITL
5:35   13:01   20:27  ITL-CVS

Of course these are not the perpetual amounts of difference. These
differences of minutes vary (up or down) through the year based on the
equations used as well as the other factor's that I've previously
mentioned on another post. I guess what I'm trying to say is that
there will always be differences either below or above any of these
tools on any given day.

For example, if someone is concerned of Maghrib being one minute early
on the ITL-CVS and late on hdate (from the list above), the reverse
does happen. Here is a list of Sunrise/Sunset times of 20041103 on
some of these tools:

7:04	11:47	16:30  marsbase.net
7:04	11:49	16:31  yanabi.com
7:05    11:48   16:31  ITL-CVS
7:05    11:48   16:30  Abdali (hdate)


Regards, 
Thamer Mahmoud