triangular object at high altitude with a pulsating blue-white light in its "rear"One triangular object flying south-to-north observed in daylight and perferctly clear sky. It had a pulsating blue-white (like a flash) light emmiting every few seconds from its "rear end" and seemed to move in small "jumps". It was directly over me and at rather high altitude (I noticed it accidentally, looking at a contrail of a jet in a different part of the sky and to another direction), so it was difficult to keep my eyes focused on it, after about 1min I lost it.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))