silver disk near Elmont Elementary School in 1977

I did not know you could report things that happened a long time ago, but when I was 7 years old and attended Elmont Elementary School, in Virginia I saw a silver disk with red, orange, white, and I think green lights around the outside of it. Elmont is a rural area of Hanover County, Virginia, about 10 miles north of Richmond, Va. It was in 1977 and I lived about a quarter-mile from the school and was walking to get there early to do some activity in the school library before classes started. I was with my friend and we were in the second grade. We were walking along some pine trees on the side of the parking lot toward where the school office and cafeteria were. I looked up across the parking lot and saw a disk that was silver and glinting in the sun just over the top of some oak trees that were in a horse pasture across the other side of the parking lot, which is not very big. The lights around the side of the disk may have blinked or changed color but I'm not sure. I just recall being in shock like I was rooted to the ground and we stopped walking and just stared.
The degree of shock at seeing it was almost like an electrical shock and I was terrified. The disk made no noise whatsoever. It was just hovering in one spot. Then, and I don't remember how long it was exactly, it was just gone and nothing was over the trees anymore. We went in and later that day I told my second grade teacher who punished me for lying. I have never forgotten seeing that and I know I did not imagine it. I still wonder what in the world it was. My friend at first denied seeing it but when I asked her a few years later she said she remembered it too. I have a law degree from the University of Virginia and am not making this up.
Date is approximate.  PD