On family holiday at Sani Resort in Northern Greece. Sighting occured at 9:30 pm facing south west on Halidiki peninsula while observing a cresent moon over the Mediteranean Sea. 4 points of light were observed near the moon, initially believed to be stars (3 in trianglar formation surrounding 1 in center). 3 stars on periphery started rotating clockwise around center star. The three rotating stars then converged on the center star, merging with it as one point of light. The remaining star then moved slowly in a north westerly direction until it drifted out of view over a builing. The event lasted 35-45 seconds.