Three definitions are to be used for the phases of the moon. The first definition mirrors that employed in the motivating work: each lunar cycle from new moon to new moon is to be split into four parts and labelled "New", "Waxing", "Full" and "Waning". The second definition centers each of those four labels around the named event: i.e., the "New" period is to be centered around the new moon event itself, instead of starting on the day of a new moon as in the first definition. The third definition will split the lunar cycle into 8 event-centred periods, called "New", "Waxing crescent", "First quarter", "Waxing gibbous", "Full", "Waning gibbous", "Last quarter" and "Waning crescent".