Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | Waning Crescent | 3.9% | π |
| Monday, May 2, 2011 | New Moon | 1.05% | π |
| Tuesday, May 3, 2011 | New Moon | 0% | π |
| Wednesday, May 4, 2011 | New Moon | 0.86% | π |
| Thursday, May 5, 2011 | New Moon | 3.67% | π |
| Friday, May 6, 2011 | Waxing Crescent | 8.4% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 14.97% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 23.17% | π |
| Monday, May 9, 2011 | First Quarter | 32.75% | π |
| Tuesday, May 10, 2011 | First Quarter | 43.33% | π |
| Wednesday, May 11, 2011 | First Quarter | 54.47% | π |
| Thursday, May 12, 2011 | First Quarter | 65.63% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 76.2% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 85.51% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 92.89% | π |
| Monday, May 16, 2011 | Full Moon | 97.81% | π |
| Tuesday, May 17, 2011 | Full Moon | 99.92% | π |
| Wednesday, May 18, 2011 | Full Moon | 99.17% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 95.78% | π |
| Friday, May 20, 2011 | Waning Gibbous | 90.15% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 82.79% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 74.24% | π |
| Monday, May 23, 2011 | Last Quarter | 64.94% | π |
| Tuesday, May 24, 2011 | Last Quarter | 55.32% | π |
| Wednesday, May 25, 2011 | Last Quarter | 45.68% | π |
| Thursday, May 26, 2011 | Last Quarter | 36.32% | π |
| Friday, May 27, 2011 | Waning Crescent | 27.5% | π |
| Saturday, May 28, 2011 | Waning Crescent | 19.48% | π |
| Sunday, May 29, 2011 | Waning Crescent | 12.5% | π |
| Monday, May 30, 2011 | Waning Crescent | 6.83% | π |
| Tuesday, May 31, 2011 | New Moon | 2.73% | π |