Moon Calendar for May, 2011
| Date | Moon Phase | Illumination | Moon Icon |
|---|---|---|---|
| Sunday, May 1, 2011 | New Moon | 3.37% | π |
| Monday, May 2, 2011 | New Moon | 0.78% | π |
| Tuesday, May 3, 2011 | New Moon | 0.01% | π |
| Wednesday, May 4, 2011 | New Moon | 1.15% | π |
| Thursday, May 5, 2011 | Waxing Crescent | 4.24% | π |
| Friday, May 6, 2011 | Waxing Crescent | 9.26% | π |
| Saturday, May 7, 2011 | Waxing Crescent | 16.07% | π |
| Sunday, May 8, 2011 | Waxing Crescent | 24.5% | π |
| Monday, May 9, 2011 | First Quarter | 34.25% | π |
| Tuesday, May 10, 2011 | First Quarter | 44.94% | π |
| Wednesday, May 11, 2011 | First Quarter | 56.12% | π |
| Thursday, May 12, 2011 | First Quarter | 67.24% | π |
| Friday, May 13, 2011 | Waxing Gibbous | 77.66% | π |
| Saturday, May 14, 2011 | Waxing Gibbous | 86.73% | π |
| Sunday, May 15, 2011 | Waxing Gibbous | 93.78% | π |
| Monday, May 16, 2011 | Full Moon | 98.3% | π |
| Tuesday, May 17, 2011 | Full Moon | 99.99% | π |
| Wednesday, May 18, 2011 | Full Moon | 98.83% | π |
| Thursday, May 19, 2011 | Waning Gibbous | 95.08% | π |
| Friday, May 20, 2011 | Waning Gibbous | 89.16% | π |
| Saturday, May 21, 2011 | Waning Gibbous | 81.6% | π |
| Sunday, May 22, 2011 | Waning Gibbous | 72.91% | π |
| Monday, May 23, 2011 | Last Quarter | 63.54% | π |
| Tuesday, May 24, 2011 | Last Quarter | 53.89% | π |
| Wednesday, May 25, 2011 | Last Quarter | 44.28% | π |
| Thursday, May 26, 2011 | Last Quarter | 34.99% | π |
| Friday, May 27, 2011 | Waning Crescent | 26.27% | π |
| Saturday, May 28, 2011 | Waning Crescent | 18.38% | π |
| Sunday, May 29, 2011 | Waning Crescent | 11.58% | π |
| Monday, May 30, 2011 | Waning Crescent | 6.12% | π |
| Tuesday, May 31, 2011 | New Moon | 2.27% | π |