Prediction Times off by an Hour but Clock reporting correct Local and UTC Time.

[Mark Thomas]

I had a version of Satscape on my computer from about this time last year.. Version 11. something...
I thought I would upgrade a few days ago..
I upgraded to the latest 12.07.14 a few days ago.. I have noticed that the passes are ahead of n2yo and some other sites by about an hour.

The PC Clock and Local time agree, and the UTC time is correct, and the PC is updated from the Internet, and matches the cellphone, etc..

The rest of the data is pretty close.. At least close enough for me, using a handheld..

I am running 32bit Windows Vista.
I renamed the directory,, downloaded and unzipped a new satscape zip file, and ran it from a new directory... Still had the same settings..
I found some of the Satscape files under a user directory, and deleted them, and ran it again..
This time, it was a fresh install, and the settings (Favorites, GPS settings, etc.. were lost)
I programmed everything back in, and started satscape again.. Same problem.
I then went to see what version of Java I was running... I am not receiving any kind of errors.. Just the time of the Pass Predictions are off by a little over and hour.

Here is the test I ran:
http://www.java.com/en/download/testjava.jsp
The results:
Your Java is updated and working.
Vendor Oracle Corporation
Version Java SE 7 Update 10
Operating system Windows Vista 6.0
Java Architecture 32 Bit.
I tested to see if any old versions of Java Existed.. I removed an old version 6 update, and a version 6 runtime environment file, according to the Java's instructions..

I tried clearing the cache in Java Resources in the Control Panel.. I did not find any Satscape files,, or the 'Satscape.jnlp. It was not listed.

The 2D and 3D Display works fine.. I tried to follow what was being suggested for the fixes..
I tried several problems,, and I like the Satscape the best... I don't want to revert back to one of the other programs if I can help it..

I would not mind trying the old version of Satscape that I had on here from last year about this time...
It was working properly last year,, but,, I have not tried it this year.. Just went ahead and upgraded before trying it.
But,, I deleted it before I did the install, and bypassed the Recycle bin..


Any suggestions would be appreciated... I don't mind trying an oder version.. Maybe 11.something,, if we can't come up with an easy fix...
I wish I would have compared them,, before the upgrade.. It would be enlightening...
Thanks guys..

[Satscape]

Hi Mark, thought I'd better respond to you, I had to make a change to time calculations in Satscape a while back as the predictions were 23 hours out caused by the 2010 leap year, so I may have to make another alteration if this is a similar bug.

I'll check it out later today and get back to you, it sounds like you've done everything possible you're end to try to fix it.

Scott

[Mark Thomas]

Thanks Scott...

When you look at it,, see if there is some sort of imported dataset that is off also..
I was comparing the pass results from:
http://www.n2yo.com/passes/?s=25544
and
http://www.heavens-above.com/PassSummary.aspx?satid=25544&Session=kebgfcokneidijbgobhiffhd

I was just looking at the passes for 12/30/2012... They are not even remotely close,,, so the 1 hour off issue is not related to this particular issue...

I noticed that I was off on my elevation.. Someone with a GPS told me I was about 1400 feet here,, but,, with the smart phone, I downloaded two apps and checked the elevation.. One said 1735, the other said 1750... I converted that over to approx 533 meters and put this into the locations tab before I did any comparison this morning.

Grrrr... I also downloaded Orbitron the other day... It doesn't agree with much of the others..
I also downloaded HamSatDroid..  It seems that Hamsat Droid, Heavens-above.com, and www.n2yo.com pretty much agree...
N2yo having more passes generall than the others..

I just thought I would mention that, in case you were thinking of comparing....

Thanks for checking it out..... I really do like your program.. I wish I had more time to chase the Satellites... Too busy most of the time, but, it seems this time of the year, I like to pull things out of the closet and take a shot at it... I have a little time before I get burried in taxes,, then,, try again for a while,, then, the spring,, I am back busy with trying to get things opened up again for the season... www.PaddleInnRafting.com is what I do, if you ever get out to Western North Carolina...
If you do,, let me take you rafting... Cheers.. and happy New Year.

[Mark Thomas]

I thought I would attach a screen shot of satscape and http://www.n2yo.com screens..

Maybe you can see something that I don't see.. I am using the same settings Lat/Lon for both of the softwares..

Is it possible, if you don't have any suggestions,, that I may try an older version,, Maybe last year about this time.. A version 11. something,, just to see what happens..
It was working before I upgraded to the latest version..

Thanks..
Mark Thomas.
 

[Mark Thomas]

I thought that maybe it might be related to a single satellite's dataset.. But, it is not..
Here is Saudistat 1C or SO-50.. A screenshot of similar prediction times being off.

I also checked the www.Ny2o.com with Amstat.com.. Those were close enough to perfect..

I have unloaded, loaded, etc.. It used to work,, before I upgraded..
Just wanted to let you know it was not limited to the ISS...

Thanks.

[Satscape]

Hi Mark,

Must admit I was stumped as to what was causing this, but I've just found a solution! Trouble is I've no idea why this has happened. If you go into the location settings, change your longitude over to EAST instead of WEST, the pass predictions seem to match N2YO, but the live Az and El will be way off as it will put you in China.

I'll have a fixed version of Satscape up real soon, but like I say, I've no idea when this 'flipped' over to reverse the East/West longitude. Also a bit confused as to why no one else has reported this issue, or maybe most people just use the live tracking? The reason I haven't noticed myself is that I'm just about on the 0 Deg Longitude divide :-)

Also, I don't keep older versions much over a couple of weeks, however there is the "Classic" version of Satscape down the bottom of the web page, I don't think it's as good as the latest, but it still works and would be interesting to see if this suffers from the same bug or not.

I'll let you know on here when I've uploaded a fixed version.

Scott

[Satscape]

P.S. Hmmmm, just been playing around with it a bit more and it seems to be working, except that changing from East to West doesn't seem to take effect right away. So, check yours is on West (and don't put a minus sign in the longitude box), click Save below that and restart Satscape, then try the pass predictions.

[Mark Thomas]

PROBLEM FIXED.... Problems with KeyBoard Driver Error... (ME on my Keyboard!!!!)..
Ok.. Sorry it took me so long... I was on the road, without my laptop...

Somehow I had East Selected, instead of West in the Lon Settings...
If someone is reading this... to Possibly not have problems,, don't use the "-" when entering the Lat/Lon Settings... Only use North/South,, and East/West..
I am not sure what happened, but,, I had entered a "-83.xxxx" instead of "83.xxxx and West.. Some where I missed the East getting selected, instead of West.

I can't see how this happened,, I have tried to Re-Create it,, and I can not make it happen again...
I don't know when it happened either,, unless I have been totally Stupid, when looking at the settings...
When I entered the Lat/Long Settings,, I guess I must have made an error...I don't know when it happened..

It was working fine on version 11.something.. I upgraded to the latest version.. I had trouble after upgrading.
I did not unload or delete the settings when I upgraded.. I just installed the new version in the same directory, overwriting the old,, (Maybe) it overwrote all,, but the settings later I found out, were under my user folder, so the settings, I think properly stayed the same. This I would have to try again and verify.
It seems that somewhere the West went to East, and should have been West...

Here is what I can't figure out.
I deleted everything,, including the settings files in the user directory.. Then I loaded Satscape into the same directory,, deleting the old files first, and the settings files also. Then I loaded the latest version,, put in the settings, and saved them..
It was still off...
I did see that the setting was East this morning,  not West..
I had previously entered the Long as a "-" number... -83.xxxxx
I would imagine, I would have checked the East/West at that point,, but,, I can't say for certain.

I have gone back,, set it with -83.xxxx,, and everything I can think of to get it to change to East without me clicking East.. I can't make it do it..
I can't figure it out...

But,, I have to think that because of this,, it has been East the whole time,,, and I have been overlooking it.... (Hmmm... Grrrr... Not like me)...
So,, it seems that the whole deal has been my fault,, for entering the -83.xxx instead of entering it without the "-",, and I had to overlook the East,, that I should have had West...

It is working great now... I love it... I prefer Satscape to any of the other programs that I have loaded and looked at...
I like to be able to show the passes for one day, or more, and print them on a single sheet, that I can put in my truck and take with me, for a short trip, or a several day trip. I also like the 2D and 3D pass graphic screens, etc.. A very nice and slick program, and very well laid out.
Thank you so much for your development and gift to the Community..

So Sorry,, I had you chasing Ghosts... Next time I have an old version, and upgrade,, I'll pick this apart, and see if I can find out what triggered this..
If I can't duplicate it,, I just have to say,, somehow, I selected East, instead of West on my own, and messed everything up...

[Satscape]

Hey don't worry about it Mark, just glad you have it sorted out. I did find one thing I need to fix, which is a good thing, if you do change the East/West selection, it doesn't take affect until you restart Satscape, which could be misleading, so I need to fix that at some point. :-)

73s

Scott

[Marco Walther]

Sorry to warm this old thread up again. But I face a similar issue. And I don't believe my `time offset' is an East/West problem. I tried a fresh `satscape' data directory but the predictions seem to be around 45 minutes off:-(

I attached a screen shot.
* Latest SatScape version running
* Running on java version "1.7.0_95" (OpenJDK Runtime Environment (IcedTea 2.6.4) (7u95-2.6.4-0ubuntu0.14.04.2)) on 64bit Ubuntu 14.04
* UTC & Local times seem correct in SatScape
* The litte red dot in the 3D view seems about right
* The locations seem about right
* But the predictions are different from my ISSAbove :-( And I know the ISSAbove was correct in the past (used it to watch the ISS fly by;-)

Something is definitely going on:-(

Any idea?

Thanks,
-- Marco
 

[Satscape]

Hi Marco,

It seems like the bug I fixed is still not fixed, so every leap year the predictions go off for the month of March only. So if you check today (1st April...not kidding!), all should be well again. I just checked mine with an online tracker and it seems spot on.

Hopefully, I'll have this fixed for March 2020 :-)

Scott

[Marco Walther]

On 04/01/2016 07:56 AM, Satscape wrote:
> Hi Marco,
> It seems like the bug I fixed is still not fixed, so every leap year the
> predictions go off for the month of March only. So if you check today
> (1st April...not kidding!), all should be well again. I just checked
> mine with an online tracker and it seems spot on.

Yes, it seems to work now;-)

Thanks for the reply;-)

-- Marco

>
> Hopefully, I'll have this fixed for March 2020 :-)
>
> Scott
>
>
>
> On Wednesday, March 30, 2016 at 10:02:04 AM UTC+1, Marco Walther wrote:
>
>
> Sorry to warm this old thread up again. But I face a similar issue.
> And I don't believe my `time offset' is an East/West problem. I
> tried a fresh `satscape' data directory but the predictions seem to
> be around 45 minutes off:-(
>
> I attached a screen shot.
> * Latest SatScape version running
> * Running on java version "1.7.0_95" (OpenJDK Runtime Environment
> (IcedTea 2.6.4) (7u95-2.6.4-0ubuntu0.14.04.2)) on 64bit Ubuntu 14.04
> * UTC & Local times seem correct in SatScape
> * The litte red dot in the 3D view seems about right
> * The locations seem about right
> * But the predictions are different from my ISSAbove :-( And I know
> the ISSAbove was correct in the past (used it to watch the ISS fly by;-)
>
> Something is definitely going on:-(
>
> Any idea?
>
> Thanks,
> -- Marco
>

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