Following is a summary of the time data offered :
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.
Japanese digital quartz chip is specified to +/- 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.
There is a slight wobble in the earths axis, caused by an unequal gravitational pull of the sun and the moon. One wobble takes about 25826 years and consist of 12 zodiacal ages. During this period, the Earth's axiswill have pointed to each zodiac constellation in turn.This cosmic year is one of the longest cycles that are well-known to our astronomers.