Seiko astron watch gps solar chronograph sas038 until the new astron no watch could adjust automatically to different time zones now thanks to the creation of an ultra low consumption gps module seiko has succeeded in harnessing the gps network so that astron adjusts to 39 time zones across the globe using just the power of light with only one touch of a button seiko astron receives signals from four or more gps satellites to automatically determine ones location and set the correct loc