ASTRON COLLECTION: Astron is the very first watch to automatically recognize perpetuity zones on Earth. With the touch of a single button, Astron adapts to the right local time all over in the world. * Seiko Astron is precise to one second every 100,000 years, thanks to the time signal it gets from the Atomic Clocks in each GPS satellite. Astron gets all the power it requires from light absorbed through the dial. Not simply sunlight, it is able to utilize all kinds of light, and shop excess energy it produces in a power reserve with charge level is shown on the dial. Astron gets GPS signals even when the wearer is walking or in an automobile. If you can see the sky, Astron will inform the exact local time, even as you cross borders. Astron has a continuous calendar that will not have to be by hand corrected till February 28, 2100. * Daylight Saving Time needs manual operation.