A brass telescope beneath the open dome of a lantern-lit observatory

LOWELL HILL OBSERVATORY / THE 1930 SEASON

GLASS SKY

Blink the plates.
Name the comet.

Two photographic plates. Thousands of quiet stars. One dot that moved. An observatory deduction game about looking closely — and finding something worth a name.

Microsoft Store Try the comparison ↓

US$9.99 base price / English only / Release pending

12Nights in the season

6Regions to survey

OfflineYour own quiet sky

01 / THE ART OF LOOKING

The stars stay still.
One visitor doesn't.

Before a discovery becomes a headline, it is a tiny difference between two photographs. Compare these plates. The same stars appear in both — but one object has changed position.

This steady sample comes from the game's seeded plate renderer. There is no timer and no automatic flashing. Take your time.

Inside the blink comparator ↗

OBSERVE / COMPARE / QUESTION

GLASS PLATE COMPARATORPLATE A / FIRST EXPOSURE

First star plate with a faint comet near the center-left

Second star plate; the same comet has shifted up and right

Plate A is visible. Switch plates to look for movement.

02 / A NIGHT'S WORK

From a glass plate
to a new name.

Learn the observatory's rhythm. Follow the evidence from the darkroom to the Bureau's ledger.

I. THE DARKROOM

Prepare the evidence.

Expose a pair of plates and develop them beneath the safelight. Stop the needle in the green zone, or skip development and work with a little more grain.

II. THE COMPARATOR

Trust what changes.

Compare, magnify and mark. A traveling point, a faint tail, a star that pulses in place — measure the difference before you decide what it means.

III. THE BUREAU

Leave a name in the sky.

File a verified comet or asteroid. Choose its name, add it to your almanac, and read the observatory's discovery in the morning paper.

Read your first-night field guide ↗

The Lowell Hill Gazette announcing a player's discovery — A genuine in-game morning edition.

03 / A LITTLE FRIENDLY RIVALRY

A name in the ledger.
A rival in the papers.

Across the hill, Dr. Elias Vane has been looking at the same sky. His reports arrive on nights 4, 7 and 10. Find a comet in that region first, and the next letter may sound rather different.

“The Bureau's ledger is open, the survey continues…”

Director Alden Marsh · Fictional in-game correspondence

A twelve-night season leads to a final bright-comet race. When the season closes, an endless seeded survey keeps the dome open.

More about the season ↗

04 / FROM THE OBSERVATORY DESK

A closer look.

Actual screenshots from GLASS SKY.
Open a plate to inspect the details.

A 30-second preview made from genuine screenshots of the prepared English-language game. Original observatory audio.

The GLASS SKY comparator showing a marked candidate and magnifying loupe — PLATE 01Mark a moving candidate

Two magnified photographic plate crops beside classification controls — PLATE 02Measure the evidence

A discovery accepted into the Bureau ledger with its player-chosen name — PLATE 03Give your discovery a name

Steady side-by-side comparison of two photographic star fields — PLATE 04Compare without flashing

The Lowell Hill Gazette with a discovery headline and fictional observatory letter — PLATE 05Make the morning paper

The observatory almanac recording named objects and prestige — PLATE 06Keep an almanac of discoveries

PLAY AT YOUR OWN PACE

A steady way to compare.

Reduced flashing starts enabled. Hold to compare, use side-by-side plates, or inspect a difference image. Development is skippable and progress saves locally.

Controls & accessibility notes ↗

JUST YOU AND THE SKY

No account. No connection.

The game is fully offline. No advertising, telemetry or in-app purchases. Your discovery names and almanac stay on your computer.

Read the privacy notice ↗

YOUR NEXT DISCOVERY IS A DIFFERENCE AWAY

The dome is waiting.

Windows x64 · Mouse & keyboard · English only

US$9.99 on Microsoft Store

Check the Store listing for availability.