UFO Sighting in Corona, California on March 25th 2016 – Saw ufo with fluorescent light in 1/4 moon shape and turning clock wise and for about every 15 seconds it made a complete circle

Making a delivery at school site and look up and saw object with bright light in a quarter moon shape going in a circle n took about 15 seconds to make complete circle. Made delivery and object was going very slow in a south east direction. Total time that object was seen was about 15 minutes