A period of 30 days, 31 days, or some alternation thereof.
A period into which a year is divided, historically based on the phases of the moon.
One day of sidereal time; the time in which Earth rotates once around its axis, relative to the point of the vernal equinox (about 23 hours, 56 minutes, 4 seconds).
The rotational period of Earth; the time in which Earth rotates around its axis 360 degrees.