Following is a summary of the time data offered:
The v4 mother board is a tightly packed design connecting the chip with the LCD, quartz oscillator, transistors, EL light, alarm and other functions.
Based on complex astronomical algorithms using UTC time reference and whole degrees of latitude and longitude, the YES watch calculates sun, moon and time data once every 24 hours, at midnight HOME time.
We used algorithms published by the US Navy and Jean Meeus. An astronomer converted them into suitable language for programming.
Since every degree of longitude represents 4 minutes the sun and moon calculations carry an accuracy of +/-2 min. Since the moon waxes or wanes approximately 4% every day, 1% of illumination is about 6 hours.
Equinoxes, solstices and cross-quarter dates are subject to some cultural interpretations, so in our calculations we chose a mathematical mid-point between equinox and solstice.
The analog Swiss hand movement is manufactured to plus 10 / minus 20 seconds a month. The Japanese digital quartz chip is specified to plus / minus 20 seconds a month.
Each sun and moon segment in the LCD display represents 15 minutes.
Each sliver in the moon phase display represent about 44 hours.
As pocket watches came into use in the early 1800's, there was a clear need for an accurate reference point by which they could be set. Dipping a flag, firing a gun or eclipsing a search light were predssecors to the time ball. Starting in1833 an astronomer would accurately pin point thesolar high noon and then at 1 o'clock PM the ball would be dropped. Placed in towers high above rivers and towns it could be seen far and away and was one of the first methods to disperse a uniform time signal.