Object traveling south-west towards rural area of the county. Dark-gray triangle shaped craft. Massive area

On 04/18/2023 on or about 2345 hrs I was sitting with a co-worker in a darkened area of a property just on the outskirts of the city in a vehicle. When I blacked out my vehicle. A moment later, I observed a triangle shape craft flying through the night sky; the object appeared to be dark gray with curriculum patterns on the bottom of the unknown craft. As I was talking with my co-worker I quickly startled him and asked him to look towards the sky. The object was in range for less than 10 - 20 seconds before it was out of sight over the darkened area.