Once that I was googling within my range of interest I fell on a website (<A href="http://www.calendrier-365.fr">http://www.calendrier-365.fr</A>) which displayed all kind of calendar.One for the Georgian time pattern of course and another one for the lunar phases. This one even beared the daily moon's visibility percentage   which scratched my mind.
From my point of view lunar mood is needed for agricultural methods but what in space is the goal of daily visibility rate ?
If it's only used for astrology calculation then remains one question : how does this percentage is gathered ?