While driving north we saw a very sharp fingernail thin elongated oval shape moving slowly in the sky at an angle. It had a short tail.

The shape was large and slow moving but very high up. It was neatly sunset and the object kept catching the light. It appeared shiny or possibly slightly transparent. At one point it went behind a large cloud and we thought it was gone but it reappeared a min later. I held my finger up to the windshield to see if it was actually moving (it was nearly fixed, but very slow) and it was indeed moving very slowly to the east.