The GPS Solar watches in Seiko’s 2024 Starry Sky limited-edition group are the SBXC157 and SBXD027. Both have light-blue dials with a pressed star motif that Seiko says changes with the viewing angle; the larger SBXC157 uses Caliber 5X83 with a dual-time display and chronograph, while the slimmer SBXD027 uses Caliber 3X62.
This is a specifications-led comparison based on Seiko’s product information, not a report of hands-on testing. Seiko scheduled the four-model Starry Sky group, which also included two solar radio-controlled watches, for release on July 6, 2024. The details below focus on its two GPS Solar models.
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[Seiko] Seiko Solar Watch Spirit Spirit Watch 10 ATM Waterproof Business Men's Women's | $209.99 | Buy on Amazon |
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Solar Chronograph Speedtimer by Seiko | $695.00 | Buy on Amazon |
What Seiko means by Starry Sky
Seiko describes the dial treatment as a pressed star motif intended to express the strong sparkle of stars across an expansive night sky. The pattern is designed to change appearance with the viewing angle. That is Seiko’s description of its design intent, not an independently tested observation.
The two watches share the light-blue dial concept and GPS Solar technology, but differ in movement, complications, dimensions, and weight. The SBXC157 is the more elaborate model; the SBXD027 has a smaller, thinner case and a simpler display.
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- Includes individual box, instruction manual (English language not guaranteed)
- Solar
- Approximately 10 months when fully charged
- Average monthly difference ±15 seconds
- Calendar (date) function
Seiko Astron SBXC157: dual time and chronograph
The SBXC157 runs Seiko Caliber 5X83 GPS Solar. Its functions include dual time, a 1/20-second stopwatch with a 12-hour counter, world time for 38 time zones, a perpetual calendar through February 28, 2100, time transfer, weekday indication, and a power-reserve display.
Its case measures 43.3 mm wide, 49.5 mm long, and 13.4 mm thick, and the watch weighs 117 g. Seiko lists a titanium case and bracelet with a titanium-and-ceramic bezel, dual-curved sapphire crystal with Super-Clear coating, and 10-bar water resistance.
Seiko Astron SBXD027: the smaller, simpler option
The SBXD027 uses Caliber 3X62 GPS Solar. Seiko lists satellite time-zone correction, a perpetual calendar through February 28, 2100, a date display, and a power-reserve display.
It measures 41.2 mm wide, 48.6 mm long, and 12.0 mm thick, with a listed weight of 110 g. Its official specifications include a titanium case, sapphire crystal with Super-Clear coating, and 10-bar water resistance.
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| Specification | SBXC157 | SBXD027 |
|---|---|---|
| Movement | Caliber 5X83 GPS Solar | Caliber 3X62 GPS Solar |
| Key functions | Dual time, 1/20-second stopwatch with 12-hour counter, world time for 38 time zones, perpetual calendar, time transfer | Satellite time-zone correction, perpetual calendar, date |
| Dimensions | 43.3 × 49.5 × 13.4 mm | 41.2 × 48.6 × 12.0 mm |
| Weight | 117 g | 110 g |
| Case and crystal | Titanium case and bracelet; titanium-and-ceramic bezel; dual-curved sapphire with Super-Clear coating | Titanium case; sapphire with Super-Clear coating |
| Water resistance | 10 bar | 10 bar |
| Limited edition | 1,500 worldwide, including 500 for Japan | 1,500 worldwide, including 500 for Japan |
| Historical Japan price | ¥286,000 including tax | ¥253,000 including tax |
Dimensions, weights, limited-edition quantities, and historical Japan prices above come from Seiko’s official Japan product records. These prices are not current quotes or estimates of resale value, and present availability was not verified.
GPS Solar and practical expectations
GPS Solar combines light-powered operation with GPS time and time-zone adjustment. Whether a watch can receive a signal depends on reception conditions; the product specifications should not be read as a guarantee of synchronization in every location or circumstance.
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Seiko lists approximately six months of operation on a full charge and approximately two years in power-save mode for both models. These are manufacturer specifications, not independently measured results. Both are rated to 10 bar; follow Seiko’s instructions for water exposure and care.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which Starry Sky Astron suits you?
The SBXC157 is the choice for someone who wants the more feature-rich display, especially its dual time and chronograph functions. The SBXD027 is the smaller and thinner option, with a more restrained set of indications. The choice is between different feature sets and proportions, not just two dial colors.
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What are the two GPS Solar models in Seiko’s 2024 Starry Sky group?
They are the SBXC157 and SBXD027. The broader four-model group also included two solar radio-controlled watches.
What is the difference between the SBXC157 and SBXD027?
The SBXC157 uses Caliber 5X83 and adds dual time, a 1/20-second stopwatch, and world time. The SBXD027 uses Caliber 3X62 and has a smaller, thinner case with a simpler feature set.
How many were made?
Seiko’s product records list 1,500 pieces worldwide for each model, including 500 allocated to Japan.
What were the Japan prices?
Seiko’s historical Japan product records list ¥286,000 including tax for the SBXC157 and ¥253,000 including tax for the SBXD027. These are historical listed prices, not verified current prices.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
