![]() Since the length of the synodic month is changing, a problem which lunar calendar makers must face is in deciding how the synodic month will change over, say, the next 1000 years. Several attempts have been made to devise such a calendar, including the Meyer-Palmen Solilunar Calendar. Thus some correction to the basic scheme of alternating 29- and 30-day months is needed in order that the new moon (or the full moon) should always occur on (or at least close to) the first day of the calendar month, or in another variation, that the full moon should always occur on (or at least close to) a date in the middle of the month (such as the 15th). Thus after ten of these 13-month years the calendar would be off by about a day, and in less than half a century would be completely out of sync with the lunar cycle. , 30 days then a calendar year, consisting of 384 days, would differ from thirteen mean lunar months by an average of 0.1023 days, since 13 x 29.53059 days = 383.8977 days. If we simply used a year of thirteen calendar months alternating in lengths of 30, 29, 30. To describe a lunar calendar as "accurate" means that the calendar months stay in sync fairly closely with the phases of the Moon over a long period of time. The current value of the synodic month (rounded to five decimal places) is 29.53059 days. ![]() (that is, average) interval in days between exact conjunctions of the Moon and the Sun (as observed from the Earth). Concerning accuracy in lunar calendars For a classification of calendars see Types of Calendars.
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