Lunar month circular, the speed of Earth's progression around the Sun varies during the year. Thus, the angular rate is faster nearer periapsis and slower near apoapsis. The same is so for the Moon's orbit around the Earth. Because of these variations in angular rate, the actual time between lunations may vary from about 29.18 to about 29.93 days. The long-term average duration is days (29 d 12 h 44 min 2.8016 s). The synodic month is used to calculate eclipse cycles. It is customary to specify positions of celestial bodies with respect to the vernal equinox. Because of Earth's precession 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