20 2000 40 200
Kepler St Greg Assisi St Bede
90 1100 150 900
1 day per year 6 days every century 3 days every 400 years 3 days every century
99 19 89 49
King Greg I Lord Gregg Pope Gregory XIII Pope Gregory IX
20002 222 2002 202
400 1100 600 900
15 95 60 75
Apr Jun Sep Nov Mar Jul Oct Dec Jan Apr Sep Dec Feb Jul Oct Nov