Egg shaped object lit-up like the moon.

Time and date are approximate. I was about 8-years old at time of sighting. Myself and a group of 5 or 6 boys were playing football in a open field at the time of sighting. It was still daylight but just getting toward dusk. Sky was clear and blue. We all seemed to notice at about the same time an egg or oval shaped object slightly smaller than a dime held at arms length. The object moved across the sky in a more or less straight line from west to east. The entire object was luminescent. As if you were looking at the moon. There was no sound and no other type of lights on object. It moved at a leisurely pace across the sky and was in sight for about 5-10 seconds. Always wondered what it was that we saw that day. I still don't know.
CORRECTION:OBJECT WAS SIGHTED IN YORK,PENNSYLVANIA-NOT MARYLAND.SORRY
Witness indicates that the date of the event is approximate.  PD