Has anyone heard of differential atmospheric refraction. I posed a question to the Tak uncensored yahoo group about violet halo on one side of Jupiter through my Tak. Like I am worried it may be a collimation issue, but all images of everything are sharp as.
One person replied he is getting similar and it is a atmospherice anomoly and he has been seeing it all this viewing season, it his case the USA. He said it is "differential atmospheric refraction".
Is anyone else noticing this or am I being fed a load of cobblers?
Incidentally it is noticable in my avatar.

Cheers.

Peter