Tubular shaped object at high altitude over souther calif

What I saw was tube shaped with flat ends the color was a pale white.  It was at what appeared to be very high altitude.  I could see shadowing with some contrast,it remained stationary for about four hours.  There were two other people who observed it. I was able to look at it with a pair of field glasses while laying on my back.  This thing was in some sort of geo sync. I watched it untill it faded from view due to diminishing daylight.  It never moved, it remained fixed in one position above my location.  It slowly faded from view while never moving.  Again it appeared to remain at a stationary point, but must have been in the atmosphere at high altitude because as daylight waned it slowly faded with the approaching dusk
Witness indicates that the date of the sighting is approximate.  PD