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Subject: Re: re Lars Tornqvist nav program - misch hints
From: Lars Tornqvist (lpt@XXX.XXX)
Date: Wed Feb 06 2002 - 07:38:55 EST
Hi Peter, George and others
Unfortunately the Sight program will only run on a Windows platform as it is
written in Visual Basic! Also I have no experience with Mac so I can't tell
if these Super Mac's are able to do it?
-
Timing :
At present the computers clock must be set to GMT to run in 'Real-Time-Mode'
This I will make user definable asap as others have asked the same question.
For now you can key in any time and date you wish and also Simulate the sky
movement - BUT if you check the checkbox "Use PC-clock" the computers time
will be used as GMT - be patient I will correct this matter!
-
Accuracy:
The Sun Moon and Planets will be accurate back in time - how long I don't
know - but believe 100 years back will give you an accuracy of the Sun
within 2-3 arcmin but Moon and Planets perhaps more! I havn't checked it
out - but let me know of your findings.
The Stars on the other hand, are not udated for Proper Motion and Apparent
movement YET - (this might be done next week) Therefore don't rely on the
Stars within +/- 2 years
Latitude and Logitude input:
You can use any postion you wish - the way to input deg.min.tens are done
this way: 120º34'5 E = -120345 : 075º45'6 W= 75456 : 55º23'6 S = -55236
etc etc. North and West are Plus(+)
I will include later the option to select which Lat or Long to be Plus or
Minus
The above way to input deg.min.tens are the same with sextant inputs
Regsrds
Lars
----- Original Message -----
From: Peter Fogg <ffive@XXX.XXX>
To: <NAVIGATION-L@XXX.XXX>
Sent: Wednesday, February 06, 2002 5:52 AM
Subject: re Lars Tornqvist nav program
> Looks very interesting, Lars, and must represent a huge amount of work.
>
> a few queries:
>
> Will it run on Macintosh computers?
>
> Is it independant of the correct GMT being displayed on the computer's
> clock? Mine is decidedly inaccurate, although it is regularly updated to
> this local time. Can the relevant local time only, with the appropriate
> correction, be used?
>
> I enjoy solving (or not) the navigational problems such as the 'Silicon
> Sea' series on the Nav. list. These can involve data from all over the
> world and any time zone, and any year. My own approach is to always
> start with local time and convert to GMT when necessary. Could your
> program cope with these parameters? For example, I note that the almanac
> is good for the next 10 years but how far back does it go?
>
> Your example shows an assumed postion in whole degrees. How would it
> cope with a DR position that may involve one tenths of a minute of long.
> or lat. ? (Personally I think that a DR to the nearest minute is all
> that is needed or practical but the problem being worked on may use
> greater precision)
>
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