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Julian date calendar - day year | vp calendar, This page previously labeled "julian date calendar". actuality, -accurate. listing day year. julian date . http://www.vpcalendar.net/Julian_Date.html The julian gregorian calendars - hermetic systems, The julian calendar, gregorian reform adoption, astronomical year numbering, julian gregorian proleptic calendars, accuracy calendars.. https://www.hermetic.ch/cal_stud/cal_art.html When leap year? | earth | earthsky, The leap year 2016, 2020! leap days extra days added calendar synchronize earth’ orbit sun . http://earthsky.org/human-world/why-do-we-need-leap-years