2 very dark, silent, unlit objects moving together, one behind the other. Low in the sky, difficult to confirm shape in dark sky.

2 objects observed moving super fast, one behind the other, making a couple slight, subtle but distinct direction changes, dark but faintly brighter than night sky over the city, no lights as you would see on a plane, silent. Not birds, too quiet for unlit drones, too fast for balloons. Seen moments ago from the roof while stargazing on a clear night here in San Francisco. Total duration observed was 15 to 30 seconds max before they passed behind buildings and my view was obscured. Too dark and blurry to determine a clear geometric or distinct shape, but they were somewhat flat and long, possibly thicker in the middle. I’ve seen commercial aircraft, the ISS, satellites and the Starlink train in the night sky but I’ve never seen anything remotely like this before. April 11, 2023, 8:45PM.