Back with a new hint on Vacheron Constantin's Grand Oeuvre this time with duial sectors indicating the time of sunset and sun rise as well as the number ogf hours of daytime and night time
The sunrise sector and hand for this watch indicate the changing times of the sunrise throughout the year, the earliest at 4am through until just before 8am depending on the time of year. The sunset is registered in the other sector calibrated for sunsets which can start from 4pm until around 7.30pm again depending on the time of year. The lower sectors are the indications for day length and night length and display the appropriate number of hours in the day time from the time of sunrise and also the number of hours of night time from the time of sunset. For example, if the time of sunrise is 4.30am and time of sunset is 7.30pm, the length of the day is therefore 15 hours. From sunset at 7.30pm to sunrise at 4.30am the length of night time is 9 hours, this gives a total length of night and day for an exact 24-hour period.