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