むかし むかし。。。

Kepler Museum in Prague and the Calendar

The most interesting thing one gets from the Kepler Museum in Prague is the ticket, which indicates the moment the ticket is printed by showing the momentary state of the sky.

To me, this ticket is another testimony of the importance of calendar, which separates a civilization from a culture, and a reminder that an empire can be built without the wheel, but not without the calendar.