As far as I know, all calendars that use lunar cycles start their months with the new moon.
A calendar of the moon is a moon phase calendar. This shows when a full moon will be, quarter moon, etc.
Because of the regularity of the lunar phases. The Moon completes a cycle, from Full Moon to New Moon back to Full Moon in about 28 days. It was probably chosen as a marker for the passage of time based on observation of this regularity.
A calendar that is based on the phases of the moon.
The calendar we use is based on the sun. Did you know that some calendars are based on the moon?
Yes, Babylon did have a calendar, based on the moon and sun.
Yes.
It can start at any part of the lunar cycle; but when used in a calendar, it is common to start it at a new moon.
It is based on the moon instead of the sun.
Our modern months have nothing to do with the moon's cycle, but there is a calendar based on lunar months.
No, it is the name given to a second full moon occurring in the same calendar month. (This does not happen often)Some sources indicate that the original "blue moon" was the 13th calendar-year full moon, which occurs because the calendar year has 11 more days than the 12 lunar months. Every two or three years there is a 13th full moon.
Although the Gregorian calendar has "months", it is not in any way governed by the phases of the moon. It is strictly a solar calendar, so its emphasis is to remain in sync with the solstices and equinoxes, the characteristics of the Earth's orbit of the sun. Only lunar calendars, like the Muslim calendar, and lunisolar calendars, like the Jewish calendar, are based on the phases of the moon, with each month beginning at the time of the new moon.
No, it has nothing to do with color. A blue moon is the name for a second full moon in a calendar month.