The sun rises around 6 a.m. and sets around 6 p.m.

The plate of the watch brightens up for the sunrise at 6 a.m., and it darkens at 6 p.m. for the sunset.

There is a boundary line, between 6 o'clock on the right and 6 o'clock on the left of the watch, which divides the day and the night.

The upper bright part is the day, and the lower dark part is the night.

There is 'E' in 6 o'clock(left) and 'W' in 6 o'clock(right), and there is 'S' in the middle of the watch.

These indicate the direction.

The sun rises from the east and sets to the west, and it the movement of the hour hand of the watch is identical to the movement of the sun.

Depends on the movement of the Sun, the day and the night is shown on the watch.

You can get the accurate altitude and movement of the Sun.