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Old Russian (Byzantine) system of chronology

Old Russian calendar - years since world creation

Old Russian (Byzantine) system of chronologyCreative Commons Attribution/Share-Alike License 3.0 (Unported)
 

Sunrise and sunset calculator

Sunrise/Sunset calculation for given latitude and longitude or for given city. Source: Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval Observatory Washington, DC 20392

Sunrise and sunset calculatorCreative Commons Attribution/Share-Alike License 3.0 (Unported)
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