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Out of This World: Reviewing the Seiko Astron GPS Watch Written by
June 8, 2016 share   tweet   share  

The Seiko Astron, released to great fanfare in 2012, tells time by receiving GPS signals anywhere on Earth. Was it a world-beater in our test? Click here to read our in-depth review of the original Seiko Astron GPS solar watch, with photography by Robert Atkinson.

The last time Seiko called a new watch “Astron,” the future of timekeeping changed forever. Launched on Christmas Day, 1969, the original Seiko Astron watch was the world’s first commercially available quartz wristwatch. At the time, Seiko said of the Astron, “Someday, all watches will be made this way.” Today, it’s saying the same thing about the new Astron. Is Seiko right? Let’s find out. If you have not read about it, the Astron is an analog, solar-powered watch that receives GPS satellite signals and adjusts to the precise local time anywhere on Earth. It recognizes all 39 time zones, besting the top mechanical watches, which can display 37, with a manual reset. The Astron covers the globe by first determining its location using GPS, then comparing that information with an onboard database that divides the Earth’s surface into one million squares, each of which is assigned to a particular time zone. That is something no other watch can do.

The Seiko Astron differs from watches that receive terrestrial radio signals from atomic clocks. So-called RC (radio-controlled) watches receive signals when they are within range of stations in the United States, Japan, the United Kingdom, Germany and China, so they do not offer global coverage. The Astron works anywhere, even in the middle of an ocean or desert, in Antarctica, or on a Tibetan mountaintop. Seiko Astron watches also automatically recognizes which time zone they are in, while RC watches do not.

The Astron also differs from Citizen’s original Satellite Wave, which receives GPS signals, but lacks a GPS geo-location function so it does not change time zones automatically. Finally, though the Astron is a GPS receiver that knows precisely where it is, it can’t direct you to that new restaurant downtown, or tell you how far it is to the 14th green. It uses GPS solely to tell time.

When you take an Astron out of the box, it may have to be charged. The Astron is powered by light – any type of light will charge its battery, but sunlight is the most efficient energizer. The charging status is displayed via an “E – F” (Empty – Full) indicator between 9 and 10 o’clock. The power reserve when fully charged is two months in active mode and six months in sleep mode. In sleep mode, the Astron does not display the time until it “wakes up” by being exposed to light.  It takes only six minutes of sunlight to provide enough power for the Astron to run for one day, but going from empty to fully charged requires 65 hours of sunlight. The GPS receiver will not operate when the watch is low on power, so regular charging is important. The Seiko Astron performs two basic types of operations with GPS signals: it can automatically and manually sync to a single satellite to make sure its local time display is accurate, and it can be manually triggered to change time zones, which requires at least four satellite signals.

The Astron automatically attempts to sync with a single GPS signal once each day. The sync can be set in motion by exposure to the sun or another strong source of light. The Astron’s programming tells it that if a strong light source is present, there’s a good chance it can receive a signal. If the Astron acquires a signal, it remembers when that happened. On subsequent days, if the watch is covered by clothing or otherwise blocked from light, it searches for the signal at the same time as the last successful attempt, assuming the chances for reception are good. To make sure it’s always on time, the Astron can also receive leap-second data. Leap seconds are added about every 18 months to account for the Earth’s slowing rotation. The most recent was added on June 30, 2012.

The Astron’s ring-shaped GPS antenna sits beneath the ceramic bezel.

Manually syncing to a GPS signal is accomplished with a simple push of a button. Because GPS satellites carry atomic clocks, their time signals are incredibly accurate. (Seiko cites the figure of one second in 100,000 years.) Regular syncs keep the Astron right on time. While the Astron’s sync functions allow it to keep time with great accuracy, the movement itself, without syncing, offers typical +/-15 seconds per month quartz performance. If you go an extended time without a sync, some error may creep into the display. Changing time zones can only be accomplished manually, and it is a bit more complex. The process is initiated by pushing and holding a button for six seconds. Once the button is released, the Astron begins to search the sky for GPS signals. In this mode, the seconds hand becomes an indicator that provides signal search status updates. The hand tallies each newly acquired signal by pointing to the corresponding hour marker, so for example after acquiring one, then two, then three satellite signals, the seconds hand points to 1, then 2, then 3 on the dial. When the search is complete, the seconds hand points to a small “Y” on the seconds track to indicate that the minimum four signals were acquired, or to “N” to indicate that the search was not successful. The small indicator between 10 and 11 o’clock also points to “4+” if the search was successful. If at least four signals were received, the hour and minute hands slowly march to their new positions to indicate the new local time.

If you prefer to set your watch to your destination time when you board the plane, Seiko Astron watches can also be reset to a new time zone manually and placed in airplane mode to turn the GPS receiver off. Adjusting for daylight saving time is another manual operation. The Astron knows its location, but it does not know the laws governing DST in all locations. A press of a button turns DST on and the DST setting is displayed on the indicator at 9 o’clock.

One satellite signal syncs the local time, while four are needed to change time zones.

To receive any satellite signals, the Astron has to be able to “see” the sky. The owner’s manual warns that outdoors, amid trees or tall buildings, receiving signals, and changing the time zone in particular, may be difficult. We tested the Astron in 12 outdoor locations to get a feel for how much sky has to be visible to pick up a signal. Our test locations included deep urban canyons in midtown Manhattan, an urban park, the center of a smaller city (White Plains, N.Y.), a small-town main street (Tarrytown, N.Y.), and three rural settings, including a wooded trail. Given the warnings, the watch performed surprisingly well. We picked up a single satellite signal in the center of Times Square and on Madison Avenue surrounded by people and tall buildings. The only setting where we could not receive a signal was on a wooded trail beneath a dense canopy of trees, which is effectively the same as being indoors.

We also had better than expected luck changing time zones, which requires four signals. We achieved success amid skyscrapers on Madison Avenue at 53rd Street, though we had to walk around a bit, pointing the watch in different directions (attracting some glances from passers-by). We also acquired four signals in downtown White Plains surrounded by mid- and high-rise buildings, and in two locations under a few trees on the main street in Tarrytown. As expected, the rural settings presented no challenges. We acquired the largest number of signals, eight, in a large park in a rural setting. We were unable to change time zones on the wooded trail, in the center of Times Square, and in front of the New York Public Library on Fifth Avenue.

Changing the time zone takes anywhere from 30 seconds to two minutes. In an age of instant gratification, some may view this as an annoying delay, but we found that the process can be fun. The Astron is essentially a wrist-mounted satellite detector, and because GPS satellites are not geosynchronous – they orbit the Earth and so are always moving in the sky – you never know where they are, or how many are overhead. So, changing time zones is like searching for satellites overhead. The Seiko Astron GPS solar technology requires a large housing, and the Astron’s case measures a substantial 47 mm by 16.5 mm. Though it’s on the large side, it is comfortable to wear. With curved lugs and a shaped strap, our test watch hugged the wrist. The holes in the strap are closely arranged to allow a good range of adjustability. Our test watch was also fairly light at 146 grams. However, the thick case and strap combine to create a bulky package, making it a tight fit under some cuffs. On my 7 3/4-inch wrist, a standard Nordstrom dress shirt cuff would not button over the watch, and with other shirts, pulling the cuff back to check the time sometimes proved a challenge.

The dramatically curved lugs help the oversize Astron fit average-size wrists.


Seiko says that the silicon strap has been specially treated, and it does have a silky smooth feel. The strong vanilla scent associated with some straps is also pleasantly absent. However, when it comes to strap colors, Seiko offers the famous Ford Model T option – you can have any color you like, as long as it’s black. The keeper on the strap is a substantial metal piece with a nice brushed finish and the Seiko name engraved. The single-folding deployant buckle is easy to adjust and to open and close. It’s well polished and instills confidence. The buckle is nicely curved and, like the case, hugs the wrist.

When it comes to aesthetics, the Astron’s look is appropriately space-age. Physics geeks might recognize a slight resemblance to the CMS detector at the Large Hadron Collider, near Geneva. The shaped hour markers float above a deeply three-dimensional display. Steeply stepped rings lead down to the dial. This arrangement is visually dramatic, though it causes the hands, and the seconds hand in particular, to be a bit too short. In a watch designed to offer ultimate accuracy, the seconds hand should not fall a few millimeters short of the seconds track. We also noticed that while the blue seconds hand on our test watch coordinated with the color of the hour markers, it offered less contrast than a white hand would provide. In some cases design trumps practicality. The translucent dial has a sunburst finish, which is appropriate given the Astron’s solar charging capability. The second time zone (or home time) is displayed in 24-hour fashion on a subdial at 6 o’clock. The date and second time zone are easy to read, though more could be done to differentiate the small hands on the second-time-zone display. Silver-colored beveled edges on raised dial indications show attention to detail.

The Astron’s dial layout is fairly standard until you reach the curving, multi-function indicator located between 9 and 11 o’clock. A single small hand indicates the state of the charge, whether the watch is in airplane mode, whether daylight saving time is indicated, and, during a time-zone reset, whether the required four satellite signals were acquired. The flat sapphire crystal is treated with Seiko’s “Superclear” coating, which the brand says reduces light reflections by 99 percent. It lived up to its name during our test.

The silicone strap is comfortable, and the deployant buckle hugs the wrist.

On the Seiko Astron watch we tested, the blue Lumibrite on the hour markers was lumpy and irregular. Other  Astrons we’ve seen exhibit the same flaw. Though it’s visible only on close inspection, for some owners, close inspection is a daily ritual, and once the eye finds a flaw, it becomes hard to ignore. The Lumibrite at the tips of the hour and minutes hands was smooth. The seconds hand has no luminous material. According to Seiko, Lumibrite charges fast and lasts long. In our test, we exposed the Lumibrite to direct sunlight for 30 minutes to see how long it would last on a full charge. After its tanning session, the Astron was sealed away from the light. We checked it hourly for the first 12 hours. After that much sun, many watches would light up like a fireworks display. The Astron did not. But what it lacked in lumens, it made up for in stamina. Indeed, the Lumibrite lasted a full 18 hours.

During the first three hours of our test, the time could be read easily in the dark. The glow was sufficient, but not impressive. After three hours, reading the time required allowing our eyes to adjust to the darkness for a minute or two. That was due to reduced luminous output, and the fact that the small amount of luminous material on the tips of the hands makes them difficult to distinguish without a close look. After 18 hours in the dark, the Astron could still be read, though just barely. Our test watch had a stainless-steel case with a polished finish interrupted only by a satin finish applied on top of the lugs. All Seiko Astron models have ceramic bezels because the material improves signal reception compared with steel. The solid caseback screws in, and the inscription on the caseback indicates 10-bar, or 100-meter, water resistance.

The screw-down crown has a softly knurled finish that looks nice but does not aid the grasp. In fact, we found the crown to be a bit slippery. Fortunately, the Astron’s crown is not used very often. Because the Astron offers lots of functionality, it comes with multiple sets of instructions. An accordion-like seven-page quick-start guide covers the basics. For more information, there’s a thicker, printed owner’s manual. To get the full story, load the included CD, sit back, and enjoy the 57-page unabridged Complete User Guide. The Astron comes in several flavors, and beyond the aesthetic variations, there’s one difference some may want to note. On our test watch, the “city ring” did not actually identify any cities. Rather, it simply offered numbers indicating offsets from GMT. Other Seiko Astron watch models take the more traditional (and informative) approach and identify major cities along with the time-zone offsets.

At the end of the day, the Astron is likely to polarize enthusiasts. Some will think the GPS “middle of nowhere” functionality is cool, and others won’t. Some may consider it a gimmick, or a gadget watch, and to those, the price, $2,300, will be too steep. If you appreciate the engineering know-how required to create an ultra-low-energy GPS receiver for the wrist, or if you want to own the first global GPS time-zone watch, or if you just want to be able to count the GPS satellites overhead, the Astron may be an appealing package. The Seiko Astron’s popularity is certainly growing. In January 2013, tennis champ Novak Djokovic, heretofore an endorser of the prestigious Swiss watch brand, Audemars Piguet, switched his wrist loyalty from Switzerland to Japan, signing on as a global “brand ambassador” for Seiko and receiving the gift of a new Seiko Astron GPS Solar watch from Seiko president Shinji Hattori on the eve of the 2014 Australian Open. Seiko has since released new iterations of the Astron, including a version with a chronograph.

So, will all watches be made this way some day? The short answer is no. To reach a point where many watches are made this way, Seiko will have to make the package much smaller and much less expensive. The odds favoring universal adoption are certainly longer than they were in 1969.

SPECS Manufacturer: Seiko Watch Corp., 8-10 Toranomon 2-Chome, Minato-ku, Tokyo 105-8467, Japan Reference number: SAST009 Functions: Hours, minutes, central seconds, date, perpetual calendar, second time zone, GPS-controlled world time with 39 time zones Movement: Caliber 7X52, solar charging Case: Stainless steel with ceramic bezel, flat sapphire crystal with nonreflective treatment, fully threaded stainless-steel caseback, screw-down crown, water-resistant to 100 meters Strap and clasp: Silicone strap with stainless-steel folding clasp Dimensions: Diameter = 47 mm, height = 16.5 mm, weight = 146 grams Variations: With black dial, titanium case and bracelet with black hard coating, limited edition of 2,500 pieces (ref. SAST001, $3,850); with black dial, titanium case and bracelet (ref. SAST003, $3,100); with black dial, titanium case and bracelet with black hard coating (ref. SAST007, $3,200) Price: $2,300

To download any of these original photos of the Seiko Astron as wallpaper for your desktop, click here .

This article was originally published in 2014 and has been updated.

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