Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 2.53% | π |
| Monday, May 2, 2011 | New Moon | 0.4% | π |
| Tuesday, May 3, 2011 | New Moon | 0.12% | π |
| Wednesday, May 4, 2011 | New Moon | 1.77% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 5.37% | π |
| Friday, May 6, 2011 | Waxing Crescent | 10.87% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 18.13% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 26.93% | π |
| Monday, May 9, 2011 | First Quarter | 36.97% | π |
| Tuesday, May 10, 2011 | First Quarter | 47.84% | π |
| Wednesday, May 11, 2011 | First Quarter | 59.06% | π |
| Thursday, May 12, 2011 | Waxing Gibbous | 70.06% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 80.19% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 88.79% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 95.22% | π |
| Monday, May 16, 2011 | Full Moon | 99.02% | π |
| Tuesday, May 17, 2011 | Full Moon | 99.96% | π |
| Wednesday, May 18, 2011 | Full Moon | 98.09% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 93.72% | π |
| Friday, May 20, 2011 | Waning Gibbous | 87.32% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 79.42% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 70.51% | π |
| Monday, May 23, 2011 | Last Quarter | 61.04% | π |
| Tuesday, May 24, 2011 | Last Quarter | 51.37% | π |
| Wednesday, May 25, 2011 | Last Quarter | 41.81% | π |
| Thursday, May 26, 2011 | Last Quarter | 32.64% | π |
| Friday, May 27, 2011 | Waning Crescent | 24.12% | π |
| Saturday, May 28, 2011 | Waning Crescent | 16.49% | π |
| Sunday, May 29, 2011 | Waning Crescent | 10.01% | π |
| Monday, May 30, 2011 | Waning Crescent | 4.95% | π |
| Tuesday, May 31, 2011 | New Moon | 1.56% | π |