Large triangle, silent, 50 to 100' altitude. 20 Minutes. Later 3 small triangular crafts, 8-10'wide, 10-12' alt. 45 sec.I was with a group of astronomers doing some star viewing through some privately owned telescopes. Someone yelled and said look at that. A huge, foot ball field sized, triangular shaped craft blacked out the stars. It was silent, moving very slow (about 7 MPH) and only 50 feet or so over head. There were lights at each point of the triangle. We watched for about 20 minutes at which point it made a strange right angle manuveur and speed off. Two military jets were chasing it. About a week later I saw 3 triangular crafts manuvering through the mountains. They were very small. About 8 to 10 feet wide. They were fast, silent, and very very low to the ground. Not more than 10 feet above ground. They were gone within about 30 to 45 seconds. I have never heard of the little ones. Have you????((NUFORC Note: Witness indicates indirectly that the date of the sighting in 2002 is approximate. We have asked him to attempt to determine the date more accurately. We have assigned an arbitrary date above. PD))((ADDENDUM FROM WITNESS))Dear Mr. Davenport,Sorry to inform you but I am not a 'mister' (Mr.). You guys sure took a long time to get back to me. UFO activity must be getting really busy. Well, lets see ............. This was about 4 years ago and I was never good with dates anyway, but I will do my best. The astronomy club met on Wednesday evenings. So in regards to the large craft, I can say for certain it was on a Wednesday night. It was during the summer months and there was no moon. You don't get good star watching when there is a full moon as it gives off too much light for star viewing. So if you go back to the summer months of 2002 and look for dates on Wednesdays when the moon was not up between about 8:30 or 9 PM, that would give you a couple of dates to go from. I don't have the tools to research that. No one logged this that I know of but there was at least 12 or 13 people there that night. These were all scientists. (They usually don't believe in anything). In fact, the president of the astronomy club, (Sirius Lookers), was only annoyed that this thing blocked out the stars and interrupted his lecture and he had to wait for it to pass. Strange but true! In fact, that was even stranger than the UFO.Regarding the small triangular crafts, well, that was also in the summer months of the same year. It was just around sundown. These small crafts were pretty strange in the way they maneuvered around the red rocks of Sedona, AZ. It reminded me of Luke Skywalker on the craft he drove through the woods in 'Star Wars'.The crafts were black, made no sound and I saw no lights on them, but then it wasn't quite dark yet, if that makes any difference. I don't have any idea as to how aliens think when it comes to putting their lights on. They drove these crafts only a few feet off the ground. I was alone when I saw the small ones. I did not log them.I'm sorry I can't be more precise. However, I did get another photograph of a UFO over Hoover Dam in 1991. I dated that one, wrote down the time and even the type of film I used, shutter speed and the whole banana. If you're interested in seeing it we can make arrangements for that.Through out my life, I have seen quite a number of UFO's. I guess they just like hanging out with me. ???? Close encounters of the 1st, 2nd, 3rd or whatever. Name your number and I can probably come up with one. I don't mean to sound flippant but that's just the way it is. Sincerely,((name deleted))((END ADDENDUM))