Alt.Azm differences in Apps?

[michaeldurban]

hello..

I use stellarium for and have recently installed SkEye on my phone.

I entered my coordinates (in the correct formats) into skeye and stellarium.

I also double checked the coordinates with my GPS (and via google maps etc.)

Thing is..

Stellarium gives me different Alt./Az coordinates than SkEye

But both have the right elevation, time (via atomic clock) and lat./longs..

Anyone suggestions?

michael

[knobby]

How far out are they ?

I've only got star walk and sky safari on my ipad and if I choose Jupiter they both give the same alt and az figures.

It's not something daft like one of the apps is picking daylight saving time is it ?

[michaeldurban]

haha..I'm not sure...haven't checked daylight savings time..

Stellarium is spot-on, and the only thing I did with that program

was entering coordinates and time.

Both time zones are the same

[Avocette]

I posted a similar question in July when I was comparing Stellarium 0.12.1 on PC against SkySafari 3.5.2 on iPad and found some significant differences. Checked again yesterday with Stellarium 0.12.4 versus SkySafari 4. With identical location settings (manually entered for Stellarium and automatic for the iPad) the Alt and Az numbers for chosen test objects matched each other.

[michaeldurban]

I checked, my phone time is set to atomic clock time and so is stellarium (+- 5 sec.)

The phone time is set to south African  time.(or GMT +2.00 hrs)

The laptop time was set to GMT + 00.00 hrs, giving me the correct time (I mean the comp.

time was the same as the phone time).

Then I changed the laptop time to GMT +2.00 hrs Pretoria time, but then the displayed

computer time changed from (let's say) 16:00 to 18:00 hours.

So, I dialed the comp. clock back by two hours.

Daylight saving is off

The descrepancy is (when looking at Rigel)

Az. offset by 45 degr.  Alt. offset by 14 degr. (assuming stellarium is correct and

the phone degrees are offset.)

From what I remember, stellarium is correct, it also shows Orion upside down

(well, the correct way Orion should be ! as in the southern hemispehe!)

Skeye show Orion as it is in the northern hemisphere.

[michaeldurban]

ah..ok...

stooopid me...

checked my Skeye's location, The GPS shows I forgot to

add a negative sign, and it was out.

So..all fixed now.

Sorry for my panic

[knobby]

Result :-)