Which program is right?

[Smokey]

I currently have 2 asto programs on my computer, "Sky Charts" and Astro Helper.
I started comparing the Azimuth and Altitude locations for Canopus and they were way different.
eg. Sky Charts Az 133-58' Alt 33-38'
Astro-helper Az 131-06.7' Alt 42-36.7'
Both programs have the same lat and long keyed in and both are on the same time-zone.
I compared a couple of other stars and they were different aswell.
Anyone got any ideas?
I,m looking into attaching setting circles to my dob. Which one would I go by?

[iceman]

What's your lat/long and i'll put the details into CDC or another of the programs I use and see what they come out with..

Not sure why they would be different.. Are they definitely both set on GMT+11?

[Smokey]

Time is definately set to GMT+11
My Lat is 37 21 6 sth
My Long is 144 44 32
Canopus at 10.52pm 2/12 is
Alt 54 32 5 Az 130 47 2 (astrohelper)
Alt 45 25 Az 130 38 (Skycharts)
:confused:

[jossupp]

can we have more info about canopus
some kind of number to be easyer to find on my carte du ciel

I am in north and I cannot find it and compare