Star Trails

This is a combination of just over 300 15-second shots with 5 second intervals in between, with the lens centred on Polaris, the North Star. There's a puzzle as it seems the camera was not steady - hence some parallel lines. But the camera was steady, well fixed on a sturdy tripod - and there was no significant wind in my back garden. The photos were taken two evenings ago when we had nice clear skies but I only combined them (via StarStax program) today to create this image

Red dots towards the bottom and non-concentric streaks are due to helicopters/planes