Features
AstroClock blends precise astronomy with readable astrology. Compute accurate charts, see strengths/retrogrades at a glance, and view major aspects with orbs and direction — all in real time, even offline.
On this page
- Core chart calculation
- Real‑time engine (Swiss Ephemeris in WASM)
- Zodiac systems & house systems
- Interpretation UI: strengths, retrogrades, aspects
- My Life: themes, transits, and Risk & Action Weather
- Zeitgeist: collective climate
- Privacy, offline mode & data storage
- Performance & reliability
- Get started
Core chart calculation
- Natal chart: Sun, Moon, Ascendant, MC, houses, placements.
- Transits: current planetary positions with clear entry/exit timestamps.
- Ephemeris: automatic Local fallback + Swiss Ephemeris for maximum precision.
Every value is computed locally; no server lookups for chart math.
Real‑time engine (Swiss Ephemeris in WASM)
- Real time Positions update continuously — not precomputed tables.
- WASM WebAssembly delivers near‑native speed in your browser.
- Offline After first load, the engine and data are cached for full offline use.
Learn more about precision and the astronomy under the hood: Swiss Ephemeris — Accuracy & Why It Matters.
Zodiac systems & house systems
- Zodiac systems: Tropical, Sidereal (Lahiri/KP), True Sidereal — MTZ (constellation‑aware with Ophiuchus). See the comparison: Tropical vs Sidereal and the method: True Sidereal (MTZ Midpoint).
- House systems: Whole Sign, Equal (from Asc degree), and (with Swiss) Placidus.
Switch frames in Settings → Zodiac system and compare results instantly.
Interpretation UI: strengths, retrogrades, aspects
- Strength badges: strong / neutral / weak — a dignity snapshot to orient your reading.
- Retrograde flags: see inward‑turning planetary phases at a glance (with re‑entries logged).
- Aspect badges: ☌ 0°, ⚹ 60°, □ 90°, △ 120°, ☍ 180°, with orb and direction (↑ applying / ↓ separating).
Not sure what each symbol means? Check the FAQ section on aspect symbols and orbs.
My Life: themes, transits, and Risk & Action Weather
- Life paths: Light/Dark thematic synthesis derived from your natal picture.
- Natal themes: grouped by houses and categories for fast scanning.
- Transit→Natal blocks: context‑aware summaries explaining “what’s active now.”
- Risk & Action Weather: Money and Life gauges with a transparent “Why?” list.
Money vs Life scoring uses different weights — see details in FAQ → Scores & Risk logic.
Zeitgeist: collective climate
- Transit→Transit focus: shows the overall “weather” beyond your personal chart.
- Daily tone: quick categories and aspect clusters influencing the day’s mood.
Privacy, offline mode & data storage
- Local‑first: your inputs stay in the browser (
localStorage); no account required. - Offline mode: after initial download, charts compute without internet. When offline, use coordinates as
lat,lon(e.g.,40.713,-74.006). - Place lookup: only the name‑to‑coordinates search needs internet.
See more in the FAQ (“Basics & Offline”).
Performance & reliability
- WebAssembly engine: Swiss Ephemeris compiles to WASM for near‑native speed.
- Smart caching: once downloaded, the engine and data are reused (no constant redownload).
- Local fallback: if Swiss can’t load, AstroClock still works so you never get stuck.