MediaWiki:Common.js

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$(function() {
    var knownNewMoon = new Date('2000-01-06').getTime();
    var lunarCycle = 29.53058867 * 86400000;
    var phase = ((Date.now() - knownNewMoon) % lunarCycle) / lunarCycle;
    var moons = ['🌑','🌒','🌓','🌔','🌕','🌖','🌗','🌘'];
    var labels = ['New Moon','Waxing Crescent','First Quarter','Waxing Gibbous',
                  'Full Moon','Waning Gibbous','Last Quarter','Waning Crescent'];
    var idx = Math.round(phase * 8) % 8;

    var div = $('<div>').css({padding:'8px',textAlign:'center',fontSize:'1.4em'})
        .html(moons[idx] + '<br><small>' + labels[idx] + '</small>');
    $('#mw-panel').prepend(div);  // or .append() to put it at the bottom
});