Prague Orloj

How to read it

Point at a step, or tap it, to light up that part of the clock.

1. 1

   The outer ring is the 24-hour day; the golden hand points to the current hour.

2. 2

   The zodiac ring maps the ecliptic in 12 signs.

3. 3

   The gold disc is the Sun; the silver one, the Moon with its real phase.

4. 4

   When both discs line up on the same side: new moon. On opposite sides: full moon.