Sander, You're pretty close... The PA is measured from the North point. So to add them you need to correct one for the quandrant ie the 297deg should be added to (180-116 = 64 degrees), 297+64 = 361, as best the accuracy allows to the expected 360, hope this helps Ken
2008/10/27 Sander Pool <[EMAIL PROTECTED]> > > Hi, > > I noticed that when I have two stars, A and B and let CdC calculate the > distance and Position Angle (PA) between them the order in which I > select them matters. I would expect the PA from A to be plus the PA from > B to A to be 360 but it's not. One particular example is this one: > > From "GSC 4048-102" to "BSC HR860" > Separation: +00°30'51.0" PA:297° > Offset: -0h03m50.4s +00°13'55" > > and > > From "BSC HR860" to "GSC 4048-102" > Separation: +00°30'51.0" PA:116° > Offset: 0h03m50.4s -00°13'55" > > The distance is the same (thankfully :) but together the PAs don't make > 360. I'm probably not understanding PA properly. Can someone explain it > please or send me a link to an article that I should read? I've googled > the subject a bit and I'm not finding fault with my reasoning yet. > > Thanks! > > Sander > > [Non-text portions of this message have been removed]
