Guam unidentified aerial event — June 1957

Light was an intense white color and disappeared due to clouds. Object moved in one straight movement through 80-100 degrees across field of view in 10 seconds. OBJECT WAS FIRST SIGHTED AT 315 DEGREES BOBBING UP AND DOWN AT A DISTANCE OF APPROXIMATELY 12 MILES, LIGHTING ESTIMATED AT ITS SAME ALTITUDE, BOBBING UP AND DOWN ACROSS THE SKY UNTIL IT DISAPPEARED AT 255 DEGREES. OBJECT WAS IN PERFECT VIEW, OBSERVED THROUGH A TELESCOPE.