Ephemeris Sky: Astrology Chart
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Description
Ephemeris Sky turns any moment in time into a precise picture of the solar system - and the cycles that drive astrology.
Pick a date, time, time zone and place - then step forward or back by hour, day, or week - and Ephemeris Sky instantly computes:
HOUSES & ANGLES
Ascendant, Midheaven, Descendant and IC, plus all twelve house cusps in six systems: Placidus, Koch, Whole Sign, Equal, Campanus and Regiomontanus. Cusps and angles are drawn right on the wheel, and the table lists every cusp by sign and degree. Enter a place by name or coordinates - nothing is looked up online.
POSITIONS
Real geocentric positions for the Sun, Moon, and the planets out to Pluto - tropical, referred to the equinox of date, the same convention professional astrology software uses. See each body's sign, exact degree and minute, and daily motion, with retrograde clearly marked.
ASPECTS
Every aspect between the planets - conjunction, sextile, square, trine, opposition - computed from the positions and ranked by exactness. Move the orb slider to widen or tighten what counts.
CHART WHEEL
A clean, live chart wheel with the zodiac ring, house cusps, planet glyphs, and color-coded aspect lines that redraws instantly for any date.
SYNODIC CYCLE (the part most apps skip)
Track each planet's full cycle relative to the Sun: inferior and superior conjunctions, the retrograde and direct stations (the famous "U-turns"), and greatest elongations - each with a real date.
ACCURACY YOU CAN CHECK
Positions are validated against NASA/JPL Horizons across 1900-2100: better than 7 arcminutes for every body, typically under 2. Houses are exact spherical trig, with sidereal time and obliquity pinned to published worked examples. We publish the numbers instead of asking you to trust us.
WHY EPHEMERIS SKY
Accurate astronomy computed entirely on your device
No account, no sign-up, no ads, no tracking, no subscription
Works fully offline
Buy once, use forever - on iPhone, iPad, and Mac
Whether you are an astrologer tracking transits and retrogrades, a student of the sky, or just curious where the planets are tonight, Ephemeris Sky gives you the real numbers - beautifully.