Lunar calendar or crescent moons and others employing detailed calculations. Since each lunation is approximately days (29 days, 12 hours, 44 minutes, 3 seconds, or days), it is common for the months of a lunar calendar to alternate between 29 and 30 days. Since the period of twelve such lunations, a lunar year, is only 354 days, 8 hours, 48 minutes, 34 seconds ( days), purely lunar calendars lose around 11 days per year relative to the Gregorian calendar. In purely lunar calendars like the Islamic calendar, the lack of intercalation causes the lunar months to cycle through all the seasons of
Banque Populaire V (Van Peteghem / Lauriot-Prévost) designed this G-Class maxi multihull. The trimaran was built by the shipyard CDK Technologies in Lorient. She was launched at the end of August 2008 in Lorient. In 2009 she made her first attempt across the northern Atlantic from west to east. On Sunday 2 August 2009, she established the new record in 3 days, 15 hours, 25 minutes and 48 seconds (an average speed of 32.94 knots), beating the previous record, held by Franck Cammas on Groupama 3, by more than 12 hours. During the attempt she also broke the 24-hour distance twice, first with