A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Greg Rudzinski
Date: 2015 Oct 8, 19:14 -0700
The original 8 day Thommen clock was gaining between 2 and 8 seconds per day. Gaining more on very hot days and gaining less on cooler days. At sea with more constant temperatures I would expect the daily rate to vary less from a mean. A two week average rate would probably do well for a few weeks if there was no way to do time ticks.
The Citizen Eco-Drive quartz models charge an internal battery/capacitor from the dial face solar cell. When new it is a good idea to put the watch in sunlight for a few days to bring the charge up to full before rating. Mine has been doing very well losing only a second per month.
From: Hewitt Schlereth
Date: 2015 Oct 8, 15:16 -0700