Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 3.08% | π |
| Monday, May 2, 2011 | New Moon | 0.64% | π |
| Tuesday, May 3, 2011 | New Moon | 0.03% | π |
| Wednesday, May 4, 2011 | New Moon | 1.34% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 4.61% | π |
| Friday, May 6, 2011 | Waxing Crescent | 9.78% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 16.75% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 25.3% | π |
| Monday, May 9, 2011 | First Quarter | 35.15% | π |
| Tuesday, May 10, 2011 | First Quarter | 45.9% | π |
| Wednesday, May 11, 2011 | First Quarter | 57.1% | π |
| Thursday, May 12, 2011 | First Quarter | 68.18% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 78.52% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 87.43% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 94.28% | π |
| Monday, May 16, 2011 | Full Moon | 98.56% | π |
| Tuesday, May 17, 2011 | Full Moon | 100% | π |
| Wednesday, May 18, 2011 | Full Moon | 98.6% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 94.64% | π |
| Friday, May 20, 2011 | Waning Gibbous | 88.56% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 80.88% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 72.11% | π |
| Monday, May 23, 2011 | Last Quarter | 62.71% | π |
| Tuesday, May 24, 2011 | Last Quarter | 53.05% | π |
| Wednesday, May 25, 2011 | Last Quarter | 43.45% | π |
| Thursday, May 26, 2011 | Last Quarter | 34.2% | π |
| Friday, May 27, 2011 | Waning Crescent | 25.54% | π |
| Saturday, May 28, 2011 | Waning Crescent | 17.74% | π |
| Sunday, May 29, 2011 | Waning Crescent | 11.05% | π |
| Monday, May 30, 2011 | Waning Crescent | 5.72% | π |
| Tuesday, May 31, 2011 | New Moon | 2.02% | π |