The lunar calendar, a base shared by the Hegirian or Islamic calendar, is calculated on a year of 12 lunar months, each alternating either 29 or 30 days. The Hegirian year, shorter than the Gregorian year, has 354 or 355 days. This difference, due to the last lunar month which contains 29 or 30 days, determines the years known as “normal” years with 354 days and the ‘leap’ years which have 355 days. The most common thirty-year periodical lunar cycle alternates 19 normal years with 11 leap years. These leap years occur on years 2, 5, 7, 10, 13, 16, 18, 21, 24, 26, and 29.
The lunar month starts when the moon is in line with the sun when seen from the earth, known as the conjunction. The month is defined as the average duration of one orbit of the moon around the earth (approximately 29.53 days).A prototype of the mechanical clock was unveiled in Abu Dhabi past November. Priced at about $2.5 million, the Clock will be produced in an edition of 10, each piece unique and made according to the client’s specifications. After Abu Dhabi, the piece will be shown at the Geneva Time Exhibition in January, before it will be ready for delivery.
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