My recent posts on the Delta/Globalstar burn visibilities raises issues about what such an event would look like. Since I have never seen one, I have to rely on previous sightings as a guide. I believe someone in the NE USA saw a Delta burn a year or two ago and Mike McCants saw a Centaur burn in the recent past. Both are liquid propellants. This seems to eliminate the concern about liquid versus solid. My initial thought was that solids would eject more particulates making them easier to see (if sunlit). Then there is the issue about when the cloud will appear relative to the firing time. Will the cloud expand slowly becoming more visible perhaps a minute or two after the firing? I will leave this to others to provide answers so we can know what to expect when this launch occurs. As far as saying one or more of the burns is visible in the central USA region, each observer will have to assess his twilight/darkness conditions. Two days ago I went out and was able to find suitable guide stars even though it seemed too light. My suggestion is to try to observe this event if you are interested even if it might appear questionable at first glance. Of course each launch delay improves the sky conditions for us east of the Rockies. Ron Lee Last year I was lucky enough to observe a SECO burn of the Delta /Globalstar launch on 04/24/98. Using elsets posted here by dedicated individuals, I was attempting to observe the "train" of sats shortly after release from the booster. I was not expecting or did I know about the SECO burn . As I remember it was at very late twilight and the burn was well back lit from the setting sun. I was using the 10x50s looking for faint objects when I saw the plume . The plume was visible immediately behind the booster. The booster was faintly visible during the burn. The plume fanned out to the rear and took on a mushroom shape . The " mushroom" grew to about 15 deg then dissipated over the next 30 seconds. This was by far the most spectacular event I have observed in my short time training my attention toward the sky . I don't have the elsets for the launch handy for this post but from my log: Launch 22:38:34 UTC 04/24/98 Observed 00:34:00 UTC 04/25/98 Lat 41.4248 N Lon 73.3610 W Thanks to all in this group that make this space enjoyable to the casual observer and avid reader . Now I just need to grt out and observe more Bud Smith