Grand Lange 1 Moonphase
How much time elapses from new moon to new moon? The accurate calculation of the so-called lunation is one of the most complex issues of general lunar theory. Indeed, it varies and over a decade can exhibit a difference of more than 13 hours. On average, a lunation lasts 29 days, 12 hours, 44 minutes and 3 seconds. Lange’s watchmakers wanted to reproduce this duration as accurately as possible.
Manually wound movement. Platinum case with leather strap. Sapphire case back. Water resistant to 30 m. Size: Diameter 41 mm, height 9.5 mm.