Measuring distance between objects

Jeff Buell Jul 12, 2009

Hi,

Using rt-click/drag to measure the distance between 2 objects doesn't
give the value for RA offset that I expect. Dec offset and distance
appear to be fine. But RA offset seems to have a factor of cos(dec)
applied to it. That is, it is accurate for 2 points on the equator, but
gives half the value I expect for 2 points at 60 deg dec. Using the
Num-0 method gives the same results.

Am I misinterpreting this feature or is this a bug? I'm using the 2
June 2008 version.

Thanks for your help,

Jeff