While playing with a foursome at Dauphin Highlands Golf Course near Harrisburg, PA on August 14, 2019, I scored a hole in one on the par 3 #15. As we are all senior golfers we played from the gold tees and it measured 148 yds to the front of the sloped green. I hit first and my ball bounced before the flag and rolled about 12' up the slope and stopped or so we thought. My playing partners all hit their tee shots and nobody landed on the green. We got into our carts and drove down the ravine and up the other side. When the green came in view I did not see my ball. I thought it had rolled off the green. One of my foursome walked to the hole and saw my ball in the bottom of the cup.