Planetary Hour Calculator

Calculate planetary hours (hora planetaria) for any location and date. Essential for timing magical operations, elections, and rituals according to traditional astrological correspondences.

What You Get

Accurate planetary hours for any location (GPS or manual entry) and date
Both diurnal (sunrise to sunset) and nocturnal (sunset to sunrise) hours
Current hour highlighted with real-time countdown to next hour
Planetary ruler, correspondences (metal, incense, color, day, sigil)
7-day forecast with copyable schedule
Uses Swiss Ephemeris precision algorithms (same as NASA)
Works offline after first load — no signup, no tracking

Free Web Tool vs Premium Android App

Feature	Free Web	Astral Lab App
Planetary hours for any location/date	✓	✓
Current hour with live countdown	✓	✓
7-day forecast	✓	✓
Planetary correspondences (metal, incense, etc.)	✓	✓
Natal chart + transits + progressions	✗	✓
Synastry (relationship charts)	✗	✓
Arabic Parts & fixed stars	✗	✓
Electional astrology finder	✗	✓
Works 100% offline	✗	✓
Price	Free	$6.50

"The web calculator showed me exactly when to launch my sigil. Astral Lab app added the natal chart context — I could see the planetary hour ruler was conjunct my natal Mercury. The electional finder saved me hours of manual calculation."

— Thomas R., verified purchaser, Astral Lab

Free vs Premium

Are the calculations accurate?

Yes. Uses Swiss Ephemeris algorithms (same precision as NASA JPL). Calculates true sunrise/sunset (civil twilight -6°), then divides diurnal/nocturnal arcs into 12 equal hours each. Accounts for latitude, longitude, timezone, DST, and atmospheric refraction.

Does the premium app need internet?

No. 100% offline. Swiss Ephemeris data embedded. All calculations local. No accounts, no telemetry.

Is this a subscription?

One-time payment of $6.50. Own it forever.

🪐 Master the Art of Astrological Timing

Planetary hours are the foundation. The Astral Lab Android app gives you: full natal chart (VSOP87/ELP2000), transits, progressions, synastry, Arabic Parts, electional finder, and exportable charts — all offline.

Natal Chart Transits Synastry Electional

$6.50

🪐 Get Astral Lab

100% offline · No ads · No tracking · One-time payment · 7-day guarantee