Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 3.35% | π |
| Monday, May 2, 2011 | New Moon | 0.77% | π |
| Tuesday, May 3, 2011 | New Moon | 0.01% | π |
| Wednesday, May 4, 2011 | New Moon | 1.16% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 4.27% | π |
| Friday, May 6, 2011 | Waxing Crescent | 9.29% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 16.12% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 24.55% | π |
| Monday, May 9, 2011 | First Quarter | 34.31% | π |
| Tuesday, May 10, 2011 | First Quarter | 45.01% | π |
| Wednesday, May 11, 2011 | First Quarter | 56.19% | π |
| Thursday, May 12, 2011 | First Quarter | 67.3% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 77.72% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 86.78% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 93.82% | π |
| Monday, May 16, 2011 | Full Moon | 98.32% | π |
| Tuesday, May 17, 2011 | Full Moon | 99.99% | π |
| Wednesday, May 18, 2011 | Full Moon | 98.82% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 95.05% | π |
| Friday, May 20, 2011 | Waning Gibbous | 89.12% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 81.55% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 72.85% | π |
| Monday, May 23, 2011 | Last Quarter | 63.49% | π |
| Tuesday, May 24, 2011 | Last Quarter | 53.84% | π |
| Wednesday, May 25, 2011 | Last Quarter | 44.22% | π |
| Thursday, May 26, 2011 | Last Quarter | 34.93% | π |
| Friday, May 27, 2011 | Waning Crescent | 26.22% | π |
| Saturday, May 28, 2011 | Waning Crescent | 18.34% | π |
| Sunday, May 29, 2011 | Waning Crescent | 11.54% | π |
| Monday, May 30, 2011 | Waning Crescent | 6.1% | π |
| Tuesday, May 31, 2011 | New Moon | 2.25% | π |