Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 3.21% | π |
| Monday, May 2, 2011 | New Moon | 0.7% | π |
| Tuesday, May 3, 2011 | New Moon | 0.02% | π |
| Wednesday, May 4, 2011 | New Moon | 1.25% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 4.44% | π |
| Friday, May 6, 2011 | Waxing Crescent | 9.54% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 16.44% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 24.94% | π |
| Monday, May 9, 2011 | First Quarter | 34.74% | π |
| Tuesday, May 10, 2011 | First Quarter | 45.47% | π |
| Wednesday, May 11, 2011 | First Quarter | 56.66% | π |
| Thursday, May 12, 2011 | First Quarter | 67.75% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 78.13% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 87.11% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 94.06% | π |
| Monday, May 16, 2011 | Full Moon | 98.45% | π |
| Tuesday, May 17, 2011 | Full Moon | 100% | π |
| Wednesday, May 18, 2011 | Full Moon | 98.71% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 94.84% | π |
| Friday, May 20, 2011 | Waning Gibbous | 88.83% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 81.21% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 72.47% | π |
| Monday, May 23, 2011 | Last Quarter | 63.09% | π |
| Tuesday, May 24, 2011 | Last Quarter | 53.43% | π |
| Wednesday, May 25, 2011 | Last Quarter | 43.83% | π |
| Thursday, May 26, 2011 | Last Quarter | 34.56% | π |
| Friday, May 27, 2011 | Waning Crescent | 25.87% | π |
| Saturday, May 28, 2011 | Waning Crescent | 18.03% | π |
| Sunday, May 29, 2011 | Waning Crescent | 11.29% | π |
| Monday, May 30, 2011 | Waning Crescent | 5.9% | π |
| Tuesday, May 31, 2011 | New Moon | 2.13% | π |