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  2. Global Positioning System - Wikipedia

    en.wikipedia.org/wiki/Global_Positioning_System

    To determine the current Gregorian date, a GPS receiver must be provided with the approximate date (to within 3,584 days) to correctly translate the GPS date signal. To address this concern in the future the modernized GPS civil navigation (CNAV) message will use a 13-bit field that only repeats every 8,192 weeks (157 years), thus lasting until ...

  3. April Fools' Day - Wikipedia

    en.wikipedia.org/wiki/April_Fools'_Day

    The festival includes a large parade in the city centre, free concerts, street fairs and performances. Festival participants dress up in a variety of costumes and walk around the city fooling around and pranking passersby. One of the traditions on April Fools' Day is to dress up the main city monument in funny clothes.