| New moon | May 2, 1840 | |
| Waxing crescent | from May 3, 1840 to May 7, 1840 | |
| Moon first quarter | May 8, 1840 | |
| Growing moon | from May 9, 1840 to May 15, 1840 | |
| Full moon | May 16, 1840 | |
| Waning moon | from May 17, 1840 to May 23, 1840 | |
| Moon third quarter | May 24, 1840 | |
| Waning crescent | from May 25, 1840 to May 30, 1840 |
| New moon | May 31, 1840 | |
| Waxing crescent | from Jun 1, 1840 to Jun 6, 1840 | |
| Moon first quarter | Jun 7, 1840 | |
| Growing moon | from Jun 8, 1840 to Jun 14, 1840 | |
| Full moon | Jun 15, 1840 | |
| Waning moon | from Jun 16, 1840 to Jun 22, 1840 | |
| Moon third quarter | Jun 23, 1840 | |
| Waning crescent | from Jun 24, 1840 to Jun 28, 1840 |
| New moon | Jun 29, 1840 | |
| Waxing crescent | from Jun 30, 1840 to Jul 5, 1840 | |
| Moon first quarter | Jul 6, 1840 | |
| Growing moon | from Jul 7, 1840 to Jul 14, 1840 | |
| Full moon | Jul 15, 1840 | |
| Waning moon | from Jul 16, 1840 to Jul 21, 1840 | |
| Moon third quarter | Jul 22, 1840 | |
| Waning crescent | from Jul 23, 1840 to Jul 28, 1840 |