Sitting in garage listening to music. had all of the lights off in garage because of the amount of bugs. staring at cell phone and happened to look up in south direction and noticed 3 very bright lights in a clearing through trees.Jumped up and walked towards house, noting tree position as it was breezy, i watched this large triangular shape, solid 3 lights moving north. very far up, probably 15000 to 25000 feet up. i made sure my eyes were adjusted, noted time and movement. yelled to my sister and brother in law to come see it. they thought i was crazy , came out and nothing. they live very close to gerald r ford airport, and since i have been here i am very familiar with planes and flight paths. this was nothing like that. if it makes a difference, i went to school for meteorology, being certified in radar and observation taking. a plane traveled through the same airspace approximately 5 minutes later on a east to west trajectory. this was 10 times as large and much slower and deliberate.