page_title: Prague astronomical clock
section_title: Old Czech time scale
hierarchical_section_title: Prague astronomical clock / Astronomical dial / Old Czech time scale
caption_attribution_description: English: Prague Astronomical Clock. Registrated from several pictures without tripod and processed with GIMP: gamma changed in parts of the picture, unsharp masked.
context_page_description: The Prague Astronomical Clock, or Prague Orloj, is a medieval astronomical clock located in Prague, the capital of the Czech Republic.
  The clock was first installed in 1410, making it the third-oldest astronomical clock in the world and the oldest clock still operating.
context_section_description: At the outer edge of the clock, golden Schwabacher numerals are set on a black background. These numbers indicate Old Czech Time (or Italian hours), with 24 indicating the time of sunset, which varies during the year from as early as 16:00 in winter to 20:16 in summer. This ring moves back and forth during the year to coincide with the time of sunset.
caption: The clock tower on a Christmas night
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