Let’s explore Seiko’s limited-edition Astron GPS Solar watches, where we’ve got two (inter)stellar models — the SSJ027 and the SSH157. Both draw inspiration from the night sky, which is fitting considering their connection to satellites orbiting in space. Each model offers something unique, depending on what you’re looking for in a high-tech, solar-powered timepiece.

First, let’s take off with the SSH157. This model is packed with features, starting with its 43.3mm titanium case and ceramic bezel. It’s designed to be durable yet lightweight, thanks to Seiko’s hard coating that fights off scratches — ideal for those who want a watch that’ll survive the rigors of daily wear (or intergalactic travel). The titanium case gives it a light, comfortable feel on the wrist, and the dial is a real eye-catcher. The transparent light blue, starry-patterned dial changes depending on how the light hits it, adding a sense of depth that makes it feel like you’re looking into sparkling tropical water.

This model is powered by Seiko’s Caliber 5X83 GPS solar movement, offering up to six months of power on a full charge and two years in energy-saving mode. Though I couldn’t test it as Seiko provided non-working samples, switching between time zones should be fast and simple: Just hold down two pushers, and the hands instantly switch to display both local time and a second time zone. There’s also a 1/20th-second chronograph. However, based on the crown and pusher feel, everything seems solid and ready for liftoff.

As expected, the lume on both models is super bright, easily readable even in dim lighting or space, and overall legibility is top-notch. Whether you’re in full sunlight or the dark of night, you’ll have no trouble checking the time here. 

Shifting gears to the SSJ027, this 3-hand model offers a simpler, more streamlined design but still packs plenty of punch. It expands on the existing quartet of similarly styled Astrons introduced in 2023. The 41.2mm angular titanium case gives it a modern, futuristic feel, almost like something you’d find on a spaceship’s dashboard. Despite its blocky dimensions, the watch is incredibly lightweight and comfortable, so don’t let the size fool you. It’s also a nice step down in sizing compared to previous models.

As for the dial? It’s mesmerizing just like its sibling’s. The light blue, textured surface catches the light and reflects it like shimmering waters — or maybe like the surface of a distant planet.

One of the standout features of the SSJ027 Caliber 3X62 is the sub-dial at 8 o’clock, which indicates whether you’re connected to a GPS signal. Why stop there, though? You could totally use it to help with major life decisions — GPS connected? Go for it. No signal? Maybe rethink that choice. The dial is less cluttered than the SSH157, which really lets that starry blue pattern shine.

Similar to the SSH157, overall legibility is excellent. While I couldn’t test the GPS connection or other features on the non-working sample, the bracelet, clasp, and overall build felt smooth and well-executed.

With that in mind, what’s the takeaway? The SSH157 is like your full-featured space explorer, packed with functionality, ideal for travelers who want GPS and multiple time zones at the push of a button. The SSJ027 is more of a sleek, angular design for those who appreciate simplicity with a futuristic edge. Whichever one you choose, you’re getting a timepiece that’s out of this world — literally, with the GPS connection — and both dials play with light in a way that keeps things interesting no matter where your adventures take you. The Seiko Astron Solar GPS SSJ027 will retail for $2,200 USD whereas the Seiko Astron Solar GPS Dual-Time Chronograph SSH157 will retail for $2,500 USD; both are limited to 1,500 pieces. For more information, please visit the Seiko website.