Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 3.66% | π |
| Monday, May 2, 2011 | New Moon | 0.93% | π |
| Tuesday, May 3, 2011 | New Moon | 0% | π |
| Wednesday, May 4, 2011 | New Moon | 0.98% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 3.92% | π |
| Friday, May 6, 2011 | Waxing Crescent | 8.78% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 15.45% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 23.76% | π |
| Monday, May 9, 2011 | First Quarter | 33.41% | π |
| Tuesday, May 10, 2011 | First Quarter | 44.04% | π |
| Wednesday, May 11, 2011 | First Quarter | 55.2% | π |
| Thursday, May 12, 2011 | First Quarter | 66.35% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 76.85% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 86.05% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 93.29% | π |
| Monday, May 16, 2011 | Full Moon | 98.03% | π |
| Tuesday, May 17, 2011 | Full Moon | 99.96% | π |
| Wednesday, May 18, 2011 | Full Moon | 99.03% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 95.47% | π |
| Friday, May 20, 2011 | Waning Gibbous | 89.71% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 82.27% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 73.65% | π |
| Monday, May 23, 2011 | Last Quarter | 64.32% | π |
| Tuesday, May 24, 2011 | Last Quarter | 54.69% | π |
| Wednesday, May 25, 2011 | Last Quarter | 45.06% | π |
| Thursday, May 26, 2011 | Last Quarter | 35.73% | π |
| Friday, May 27, 2011 | Waning Crescent | 26.95% | π |
| Saturday, May 28, 2011 | Waning Crescent | 18.99% | π |
| Sunday, May 29, 2011 | Waning Crescent | 12.09% | π |
| Monday, May 30, 2011 | Waning Crescent | 6.51% | π |
| Tuesday, May 31, 2011 | New Moon | 2.52% | π |