Seiko Astron Complete User Manual page 8

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READ FIRST
When the region or time zone where the watch is used is
changed
Adjust the time zone.
The watch displays the precise local time.
Time zone adjustment

Time Zone P . 6

Time zone display and list of time zones around the world

Los Angeles 7:00 pm on 6th
The following functions are included
P . 16
P . 11
London
1:00 pm on 7th
ASTRON 8X82 GPS SOLAR
To set only the time
The watch displays the precise time of the time zone that is set by
operation of "manual time adjustment."
How to manually adjust the time

Check the time zone and DST (Daylight Saving Time) setting

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P . 23
P . 19