The perpetual calendar is a timekeeping device over the duration of the year with a fixed date from the first day of the year, and the first day of the week to the end of the month of the year.
It is not just an ordinary calendar, it also contains all the information about the days and months. A good way not to forget the summer or winter solstice, a perpetual calendar starts with the current year and adds a day every four years, it will reach 365 days or 366 days depending on the leap year.
It is not only a calendar, it also contains all the information about the days and months. A good way not to forget the summer solstice or the winter solstice. Combine it with a lunar calendar to be informed of any lunar change such as the new Moon or the full Moon which correspond to the Moon phases on the lunar cycle, or with the solar calendar to be more precise on the sunset and sunrise of the next day.