Chart Lab: TikTok Edition
A real ephemeris, not a vibes generator. Enter your birth data, tap anything you do not understand, and leave knowing how your chart was actually built.
Your birth data
Date and place are required. Time is optional, and there is a button below for when you do not have it.
Leave blank if unknown.
City lookup supplies latitude, longitude, and the time zone, including historical daylight saving rules.
Enter coordinates manually instead
North positive, south negative.
East positive, west negative.
Include daylight saving if it was in effect.
How this was actually calculated
Tap any line. This section exists because most chart apps will not tell you their method, and a beginner deserves to know what is measurement and what is interpretation.
Archetype mode
Same chart, read as character rather than coordinates.
Positions from Astronomy Engine. Geocoding from Open-Meteo. Time zone history from your device time zone database.
Astrology Reading Center
Practitioner desk. Live ephemeris, traditional and modern derivation, and a practice mode for reading cold.
Chart data
Blank runs an untimed chart.
No list to pick from. Type it however you like and press calculate. Coordinates such as 38.75, -121.29 also work.
Drives dispositors and house rulers.
Enter coordinates and offset manually
Overrides the time zone lookup.
Focus and notes
Opening summary
Plain language you can read aloud. Generated from the calculated chart, not from a template.
Calculate a chart to build this.
Chart wheel
No chart yet.
House cusps
No chart yet.
Placements with condition
Tap any row for the derivation and the delineation cue. Dignity, sect status, and solar phase are computed, not looked up.
No chart yet.
Cross-check against another ephemeris
Optional. Paste an endpoint or a JSON payload from your Swiss Ephemeris service and this compares longitudes body by body, so you can prove the numbers rather than trust them.
Placeholders {date} {time} {lat} {lon} are filled from the current chart. Time is sent as UTC.
Calculate a chart to build the structural breakdown.
Timing as of
Times are read in the sitter birth place time zone so that profection and transit dates stay consistent.
Calculate a chart first, then run timing.
Delineation desk
A fixed reading order with your chart data already filled in at each step. Work top to bottom and you will not lose the thread mid session.
Calculate a chart to build the worksheet.
Chart drill
Questions are generated from the loaded chart, so the answers are checkable. Answer out loud first, then reveal.
Calculate a chart, then start a drill.
Timed practice
Turn on cold read mode, start the clock, and speak the chart from the data alone. Stop the clock and log how it went.
00:00
Practice history
Working library
What this tool computes and what it does not
Sitters
Saved sessions
Positions computed in your browser with Astronomy Engine. Place lookup by Open-Meteo. Time zone history from your device database.
Adventures in Astrology
Chart Lab
Study a chart one piece at a time. Pick a lens, tap any planet on the wheel, and get a plain-English read that deepens with your level. Powered by Swiss Ephemeris.
Western Astrology Chart Study Hub
Study Path
Reading Method
Chart Lab
Chart Study Output
Placement Table
| Point | Sign | House | Aspect or Note | Study Tag |
|---|
House System Settings
System Lens
House System Library
Placement Builder
Placement Interpretation
Aspect Lab
Aspect Reading
Astrology Library
Practice Note
Saved Study Notes
Advanced Chart Calculator
Enter a birth city — we'll handle coordinates, timezone, and historical DST automatically. Calculations run entirely in your browser with arcminute accuracy.
Fill in the fields above and click Calculate Chart.