Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 2.44% | π |
| Monday, May 2, 2011 | New Moon | 0.36% | π |
| Tuesday, May 3, 2011 | New Moon | 0.14% | π |
| Wednesday, May 4, 2011 | New Moon | 1.85% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 5.51% | π |
| Friday, May 6, 2011 | Waxing Crescent | 11.06% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 18.37% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 27.21% | π |
| Monday, May 9, 2011 | First Quarter | 37.28% | π |
| Tuesday, May 10, 2011 | First Quarter | 48.17% | π |
| Wednesday, May 11, 2011 | First Quarter | 59.39% | π |
| Thursday, May 12, 2011 | Waxing Gibbous | 70.37% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 80.47% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 89.01% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 95.37% | π |
| Monday, May 16, 2011 | Full Moon | 99.09% | π |
| Tuesday, May 17, 2011 | Full Moon | 99.94% | π |
| Wednesday, May 18, 2011 | Full Moon | 97.99% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 93.56% | π |
| Friday, May 20, 2011 | Waning Gibbous | 87.11% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 79.17% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 70.24% | π |
| Monday, May 23, 2011 | Last Quarter | 60.75% | π |
| Tuesday, May 24, 2011 | Last Quarter | 51.08% | π |
| Wednesday, May 25, 2011 | Last Quarter | 41.53% | π |
| Thursday, May 26, 2011 | Last Quarter | 32.38% | π |
| Friday, May 27, 2011 | Waning Crescent | 23.88% | π |
| Saturday, May 28, 2011 | Waning Crescent | 16.28% | π |
| Sunday, May 29, 2011 | Waning Crescent | 9.84% | π |
| Monday, May 30, 2011 | Waning Crescent | 4.83% | π |
| Tuesday, May 31, 2011 | New Moon | 1.49% | π |