The sky train an observer predicted
Marco Langbroek calculated where to look before the first Starlink train arrived. Compare his original Leiden recording with his separately dated follow-up photograph.
What to keep in mind
The film and photograph are four days apart. Trail lengths depend on exposure; the observer’s count is a lower bound, not a guarantee that every launched satellite was resolved.
Follow the train
Watch for the faint initial points and the tighter group. Which lights can you count confidently through the cloud, and which should remain uncertain?
Read the later photograph
Inspect the printed time and short trails. What changed by this later night, and which differences could also come from camera settings?
Compare prediction with observation
The observer reports a close sky-track match but an early arrival. What would a successful direction prediction establish, and what timing error would remain?