Seiko ASTRON Instructions de montage

8X53

HANDY MANUAL

Printed in Japan

　　BSN 8X53-A1604

English

1 2

For details, please read the

“8X53 (GPS Solar) Complete User Guide”

(http://www.seikowatches.com/support/ib/index.html).

Please carefully read the

instructions in this Complete User

Guide before using the watch.

Length adjustment service for metallic bands is

available at the retailer from whom the watch was

purchased. If you cannot have your watch repaired

by the retailer from whom the watch was purchased

because you received the watch as a gift, or you moved

to a distant place, please contact SEIKO WORLDWIDE

SERVICE NETWORK.The service may also be available

on a chargeable basis at other retailers, however, some

retailers may not perform the service.

If your watch has a protective film for preventing

scratches, make sure to peel it off before using the

watch. If the watch is used with the film on it, dirt, sweat,

dust, or moisture may be attached under the film and

may cause corrosion.

1. Features��3

2. Names of the parts ��5

3. Check the charging status ��7

4. Time zone �� 9

5. Time zone display and list of

time zones around the world�� 11

6. Time Zone Adjustment�� 13

7. Manual time zone selection of the

main-dial �� 15

8. Manual time zone selection of the

sub-dial �� 17

9. DST setting of the main-dial �� 19

10. DST setting of the sub-dial�� 21

11. How to manually adjust the time �� 23

12. When boarding (in-flight mode ( ))� 25

13. Leap second (Automatic leap second

reception function) �� 27

14. Reception result display �� 29

15. How to check when the time zone

information was configured for your

watch �� 31

CONTENTS

3 4

GPS signal reception

　Features

This is a GPS solar watch.

Standard Charging Time

This watch can be set to the precise

local time by just one button

operation



anywhere in the world.



DST (Daylight Saving Time) can be set manually.

This watch quickly adjusts the time by

receiving GPS signals

from GPS satellites.

This watch responds to

a total of 40 time zones

around the world.

When the region or time

zone where the watch is

used is changed, please

carry out operation of

“time zone adjustment.”

GPS signal reception consumes a lot of energy. It is necessary to charge the watch by exposing it to light so

that the indicator hand points to the “middle” or “full” position. (If the charging status is displayed as “low,” the

reception will not start even with manual GPS signal reception.)

The figures of “Time required for charging the watch to start moving at one- second intervals” are estimations of time required to charge the stopped

watch by exposing it to light until it moves at steady one-second intervals. Even if the watch is partially charged for a shorter period, the watch will

resume one-second- interval movement. However, it may shortly return to two-second-interval movement. Use the charging time in this column as a

rough guide for sufficient charging time.

The required charging time slightly varies depending on the design and the dial color of the watch.

Illumination

lx (LUX)

Light

source

Condition

(Example)

From the state where the watch is

stopped (not charged)

In the state where the hand

moves (the watch is charged)

To fully charged

To one-second interval

movement is secured

To move for one day

700 Fluorescent light General offices －－ 3.5 hours

3,000 Fluorescent light 30W 20cm 420 hours 12 hours 1 hours

10,000

Fluorescent light Sunlight

Cloudy day 30W 5cm 11 5 hours 4 hours 15 minutes

100,000 Sunlight

Sunny day (Under the direct sunlight on a summer day)

50 hours 1.5 hours 10 minutes

When the energy

stored in the watch

runs out completely,

it takes time to fully

charge the watch,

so please keep in

mind to charge the

watch regularly.

Solar charging Function

This watch operates by solar charging.

Expose the dial to light to charge the watch. Once

fully charged, the watch runs for approximately 6

months.

Automatic time adjustment function

This watch automatically adjusts the time in

accordance with action pat terns during use.

When the watch has sensed sufficient brightness under

an open sky, it automatically receives GPS signals

from GPS satellites. This function enables the watch to

automatically adjust

the time precisely

even while you are

using the watch.

This watch is

unable to receive

GPS signals

when the energy

stored in the

watch is low.

5 6

　Names of the parts

Crown

Minute hand

Sub-dial

AM/PM hand

Date

Button B

Hour hand

Button A

Second hand

Indicator hand

Sub-dial

(12-hour system)

Day hand (day of the week)



Position of each display may differ depending on the

model (design).

7 8

　Check the charging status

Indicator

display

Charging

status Solution

full Reception is

allowed.

middle Reception is

allowed.

Indicator display

Movement of second hand

Charging status Solution

1-second

interval

movement

low

The watch

is unable to

receive GPS

signals, but

has energy

to operate.

Charge the watch at least until

the indicator hand points to

“middle” so that the watch is

able to receive GPS signals.

2-second

interval

movement

The watch

is unable to

receive GPS

signals, and

does not

have energy

to operate.

(The energy

depletion

forewarning

function is

activated.)

Continue to charge the watch

at least until the indicator hand

points to “middle” so that the

watch is able to continuously

operate and receive GPS signals.

5-second

interval

movement

The charging status is

not displayed for the

in-flight mode ( ).

Reset the in-flight mode ( ) as

long as possible.

When the indicator hand points

to “low,” charge the watch.

The indicator hand position shows whether this watch is able or unable to receive GPS signals.

In addition, for the low charging state, the movement of the second hand shows the energy depletion state in

further detail.

GPS signal reception requires a lot of energy. It is necessary to regularly charge the watch by exposing it to light.

Reception is

allowed

Reception is

not allowed

910

　Time zone

Based on Coordinated UniversalTime (UTC), the

standard time commonly used is adopted by countries

and regions around the world.The standard time is

determined by each country or region, and the region

where the same standard time is adopted is referred

to as the time zone, and presently, the time zone is

divided into 40 zones as of March 2015.

Further, DST (Daylight SavingTime) is individually

adopted in countries and regions.

DST (Daylight SavingTime)

Depending on the area, DST (Daylight Saving Time) is

individually set.

Daylight SavingTime, or summer time, is a system

to lengthen daylight time by advancing 1 hour when

daylight time is longer during summer. Daylight

saving time has been adopted in about 80 countries,

mainly in Europe and North America.The adoption and

duration of daylight saving time varies depending on

the country.

Daylight SavingTime is subject to change due to circumstances

of the country or region.

Coordinated UniversalTime

(UTC)

UTC is the universal standard time coordinated

through an international agreement. UTC is the

primary time standard for recording time around the

world. The time obtained by adding a leap second to

the “International AtomicTime (TAI)” is determined

based on the atomic clock around the world. It is

coordinated in order to compensate for deviations

from universal time (UT) which is astronomically

determined by the UTC.

11 12

　Time zone display and list of time zones around the world

The displays of city code and the time difference from

UTC are Subject to change depending on model.

“·” between figures of the display of time difference

shows that there is a time zone in that place.

Display of

time difference

The following list shows the relationship between

displays of the bezel and dial ring and time difference

from the UTC.

Please refer to the second hand positions below to set

the time zone or to check the time zone setting.

DST (Daylight SavingTime) is used in time zones with a mark.

In the Lord Howe Island time zone in Australia with a mark, the time is

advanced by 30 minutes while Daylight SavingTime (SummerTime) is in effect.

This watch corresponds to DST in the Lord Howe Island time zone.

The time zone of each region and DST (Daylight SavingTime) are as of

March 2015.

Display of time zone

Representative city names…28 cities

among the total of 40 time zones

around the world

Time difference…+14 hours ~ –12 hours

City

code

Display of time

difference

City name UTC

± hours

BJS 8 Beijing +8

— • Eucla +8.75

TYO 9 Tokyo +9

ADL • Adelaide +9.5

SYD 10 Sydney +10

— • 

Lord Howe

Island

+10.5

NOU 11 Nouméa + 11

— • Norfolk

Island +11.5

WLG 12 Wellington +12

— • 

Chatham

Islands +12.75

TBU 13 Nuku’alofa +13

CXI 14 Kiritimati +14

—–12 Baker Island –12

MDY – 11

Midway

islands

–11

City

code

Display of time

difference

City name UTC

± hours

LON UTC London 0

PAR 1

Paris/Berlin

CAI 2 Cairo +2

JED 3 Jeddah +3

— • Tehran +3.5

DXB 4 Dubai +4

— • Kabul +4.5

KHI 5 Karachi +5

DEL • Delhi +5.5

— • Kathmandu +5.75

DAC 6 Dhaka +6

— • Yangon +6.5

BKK 7 Bangkok +7

City

code

Display of time

difference

City name UTC

± hours

HNL –10 Honolulu –10

— •

Marquesas

Islands

–9.5

ANC –9 Anchorage –9

LAX –8 Los Angeles –8

DEN –7 Denver –7

CHI –6 Chicago –6

NYC –5 NewYork –5

— • Caracas –4.5

SDQ –4 Santo

Domingo –4

— • St. John’s –3.5

RIO –3 

Rio de Janeiro

–3

FEN –2 Fernando de

Noronha –2

PDL –1 Azores –1

13 14

　Time Zone Adjustment

Go to a place where

GPS signals can be

easily received

Move to the outdoors

under an open sky

with good visibility.

The time zone where you are is localized to adjust the watch to the precise current time

by just one button operationanywhere in the world.

DST (Daylight Saving Time) can be set manually.

How to adjust the time zone

Time zone adjustment

Precautions on time zone adjustment

If the time zone is adjusted near a time zone boundary, the time of the adjacent time zone may be displayed.

In some areas the boundaries observed by the watch may not exactly correlate to the actual time zone markers on the land.

This does not indicate a malfunction. In this case, set the time zone in the manual time zone setting mode.

When the time zone is adjusted while traveling on land, avoid time zone boundaries to carry out time zone adjustment in

the representative cities in the time zone whenever possible. In addition, when the watch is used near time zone boundaries,

make sure to check the time zone setting, and manually set the time zone as necessary.

Continue to press Button A (6 seconds),

and then release it when the second hand

moves to the 30-second position.

Although the second hand moves to the

0-second position 3 seconds after pressing

Button A, continue to press it.

When the second hand has reached

the 30-second position, reception is

started.

The indicator hand points to “4+.”

While the indicator hand points to “low” or ,

reception is not started even with operation

for reception.

When the hand points to “low,” charge the

watch by exposing it to light.

Check whether the watch is able/unable to

receive GPS signals

When the hand points to , reset the in-

flight mode ( ).

Press for

6 seconds

3Direct the watch face upward and

wait

Display during reception (= satellites

acquisition status)

The second hand indicates ease of

receiving (= number of GPS satellites

from which GPS signals are received).

Even when the hand points to 4

units or more, reception may not be

allowed.



Please note that it may be difficult to receive

GPS signals while you are in motion.

To cancel the

reception, press

Button B.

It takes a maximum

of 2 minutes to

complete reception.

It depends on the

receiving conditions.

Second hand

position

25-second

Number of

satellites

5 units

The larger

the number

of acquired

satellites there

are, the easier

it is to receive

GPS signals.

JJY

May receive

3 units

4 units

5 units

6 units

・

2 units

0 units

Press

When the second hand

points to “Y” or “N,”

reception is completed.

During movement of the

date, the buttons cannot be

operated.

Manually set Daylight Saving

Time (DST).

The reception result is

displayed for 5 seconds.

Then, the hour and minute

hands move, and the time

and date are adjusted. (The

time zone is also adjusted

to the local time zone.)

Reception

result

display

Y: Successful

N: Failed

Display

Check that the reception

is successful after the

watch returns to the

time display mode.

0 1 2

Pull out

to the

1st click

0 1 2

Push

back in

15 16

　Manual time zone selection of the main-dial

In places where the time zone cannot be adjusted, the time zone can be set manually.

Pull out the crown to the first

click

The second hand moves

to display the currently set

time zone.

Push the crown back in

The second hand returns

to the time display mode.

The indicator hand returns

to the display of charging

status.

Turn the crown and set the second hand to the time zone of the destination

When the crown is turned,

the second hand moves to

the next zone.

During movement of the

date, the buttons and crown

cannot be operated.

How to manually set the time zone

Turn the crown

clockwise to

advance 1 time

zone.

Turn the

crown counter

clockwise to

set back 1 time

zone.

< Display of the indicator

hand >

Displays ON/OFF setting of

DST (Daylight SavingTime).

Manual time zone selection

DST OFF ON

Display

Hand

position •DST

17 18

　Manual time zone selection of the sub-dial

Adjust the sub-dial by selecting the time of the time zone.

The sub-dial cannot be adjusted to a time outside the time zone.

Manual time zone selection of the sub-dial

How to select the manual time zone of the sub-dial

Pull out the crown to the first

click

The second hand moves

to display the currently set

time zone.

0 1 2

Pull out

to the

1st click

Push the crown back in

The second hand returns

to the time display mode.

The indicator hand returns

to the display of charging

status.

During movement of the

date, the buttons and crown

cannot be operated.

0 1 2

Push

back in

Press Button B

The second hand moves

to display the currently set

time zone of the sub-dial.

The day hand points to ∆.

0 1 2

Press

Turn the crown and set the second

hand to the time zone of the

destination

When the crown is turned,

the second hand moves to

the next zone.

Turn the crown

clockwise to

advance 1 time

zone.

Turn the

crown counter

clockwise to

set back 1 time

zone.

< Display of the indicator

hand >

Displays ON/OFF setting of

DST (Daylight SavingTime).

DST OFF ON

Display

Hand

position •DST

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