I've been out of town a lot recently and have not had the time to report an interesting observation of Mars I made early in the morning of Saturday, July 26. I was observing from a site on the Virgin River in Rockport, Utah, starting just before the beginning of twilight and ending about 5:30 AM MDT. The transparency was so-so (my green laser worked great!) but the seeing was very good to excellent. At that time Mars did not present a particularly interesting aspect to Earth, so perhaps I only noticed the following because there was little other detail to see: Along Mars' morning terminator, I saw a distinclty bluish hue. At first I attributed the color to my optics (5" Meade APO w/ Meade ultra-high transmission star diagonal, two 2x Barlows and a 4.7mm Plossl eyepiece, about 970x). To verify whether this was the case, I rotated the eyepiece, barlows and diagonal, removed one barlow and nudged the telescope, but the blue fringe was still there and was not observable elsewhere on the planet's limb. I've read about and seen the blue morning haze (frost?) in photographs, but I just assumed it was not observable visually. Anyone else had a similar experience? Kim A. Hyatt, AIA SL&A Architects 331 South Rio Grande, Suite 304 Salt Lake City, Utah 84101 Tel: 801.322.5550 x122 Fax: 801.322.5557