Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 2.89% | π |
| Monday, May 2, 2011 | New Moon | 0.55% | π |
| Tuesday, May 3, 2011 | New Moon | 0.05% | π |
| Wednesday, May 4, 2011 | New Moon | 1.48% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 4.85% | π |
| Friday, May 6, 2011 | Waxing Crescent | 10.14% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 17.2% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 25.84% | π |
| Monday, May 9, 2011 | First Quarter | 35.75% | π |
| Tuesday, May 10, 2011 | First Quarter | 46.55% | π |
| Wednesday, May 11, 2011 | First Quarter | 57.76% | π |
| Thursday, May 12, 2011 | First Quarter | 68.81% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 79.08% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 87.89% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 94.6% | π |
| Monday, May 16, 2011 | Full Moon | 98.72% | π |
| Tuesday, May 17, 2011 | Full Moon | 99.99% | π |
| Wednesday, May 18, 2011 | Full Moon | 98.44% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 94.34% | π |
| Friday, May 20, 2011 | Waning Gibbous | 88.15% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 80.39% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 71.58% | π |
| Monday, May 23, 2011 | Last Quarter | 62.15% | π |
| Tuesday, May 24, 2011 | Last Quarter | 52.49% | π |
| Wednesday, May 25, 2011 | Last Quarter | 42.9% | π |
| Thursday, May 26, 2011 | Last Quarter | 33.68% | π |
| Friday, May 27, 2011 | Waning Crescent | 25.06% | π |
| Saturday, May 28, 2011 | Waning Crescent | 17.32% | π |
| Sunday, May 29, 2011 | Waning Crescent | 10.7% | π |
| Monday, May 30, 2011 | Waning Crescent | 5.46% | π |
| Tuesday, May 31, 2011 | New Moon | 1.86% | π |