The Astrolabe

How to play

Turn the alidade by dragging on the astrolabe or on the sky, with the arrow keys ← → ↑ ↓ (1° per press, finer steps with Shift) or with the −5° −1° +1° +5° buttons. When the golden ray reaches the sun, read the degrees and confirm with the Confirm button, Space or Enter; an error of up to ±4° is accepted. After each measurement a card explains the astrolabe that Muslim scholars developed to find the time, the Qibla and the times of prayer; the F key turns the astrolabe over. Five measurements, with points for accuracy.

• 🆓 Completely free, no sign-up and no download.
• 📱 Works on phone, tablet and PC, with touch or keyboard.
• 📲 After each round, share your score on WhatsApp and challenge friends to beat it.