IOAA 2012, Наблюдения, втора нощ, английски — Задача 1

Star charts 4–6 are supplied from the corresponding Bulgarian observational packet. Its filename is English, but its task sheet and captions are Bulgarian. The original English text-only edition and its inline key are retained: task2 gives only a)1.5 and b)0.5 without explaining these values; no missing drawing is invented. The time limits differ between the English and Bulgarian packets, so the English inline key governs this edition.