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
Harry Earnshaw seconds. In 1938 Earnshaw won the British Best All-Rounder with the record average speed of 22.627 mph. This was reward for his victory in the Westerley 100-mile competition in a record time of 4 hours 20 minutes 48 seconds, plus two seasons best performances of 50-miles in 2 hours 4 minutes 21 seconds and 249 miles in 12 hours. Harry Earnshaw's achievements were celebrated in 1938 when Cycling Weekly awarded him his own page in the Golden Book of Cycling. In his senior years he became an accomplished after dinner speaker, but later came the sad news of his multiple