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The ancient Bulgarian calendar is based on observations of Jupiter (Yankul) and the Sun and is more precise than the modern Western calendar in use today. Under the ancient Bulgarian calendar system, the year has 365 (or 366) days, 4 quarters, 52 weeks and 13 months, of which the 13th consists of only 1 day (the New Year Day). Therefore, every year, the same date always falls on the same day of the week. This calendar is considered by UNESCO to be the most accurate calendar known to man.[citation needed]
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