Skip to content
The real sky, measured for where you stand

Tonight's Sky

Every light on this dome is computed for your place and minute: 1,627 real stars, the five naked eye planets, the Moon with its true phase. The seven classical bodies carry their generation names from the Septenary line, labeled as tradition, never as measurement. Step outside and check it.

Horospire concept proof

Sky Tonight

North at top, east at left, the way star charts are drawn. Drag to turn, scroll or pinch to zoom, tap anything.
--:--
Measured: computed for your place and minute from the real catalog · Tradition: labeled apart, never as measurement · 1,627 stars, Hipparcos via HYG · Emblems: game-icons.net, CC BY 3.0

Tonight differs from last night

Computed live when this page loaded. The sky is never the same two nights running.

Above your horizon right now

Directions and heights are measured for your location this minute.
BodyWhereHeightSign nowLine

The night's ladder

When the light leaves and returns, computed for your coordinates.

The seven generations, tonight

Sun through Saturn, the Septenary line. Positions are measured; the generation names are tradition, held apart on purpose.

The four watchers

The Bundahishn names four stars watching the quarters of the sky. Two identifications are secure, two are probable, and the copy says so.

What is measured here, and what is tradition

Two registers, kept apart on purpose, on every surface of this page.
Measured

Star, planet and Moon positions are computed from your coordinates and the clock, to well under a degree. Rise and set times, twilight stages and the Moon's lit fraction are calculated the same way, for your place and minute.

Nothing on this page is hashed from the date. If a number is shown, it was computed, and you can step outside and check it.

Tradition

The zodiac signs used in readings are 30° spans of the year anchored to the equinox. The constellations behind them are unequal star patterns, and the two drifted about 24° apart over the centuries.

Generation names, watcher names and sign meanings are tradition: always labeled violet, never presented as measurement.

The registers never blend, and no star is ever for sale

The stars your grandmother saw

The stars above you tonight are the same lights every generation of your line stood under. The reading tells you what the seven bodies passing among them carry for your line today.

Get your reading

Where is your sky?

The dome above you depends on where you stand. Choose how to set it.

Your position stays in this browser. It is used only to draw the sky. Note: some embedded previews block the location prompt; the timezone guess always works.