THE SKY IN MOTION

Natal Chart + Transits

Follow moving planets against your fixed birth chart. Inspect aspects, natal house placements and exact passages over time.

Birth data

Birth date

Birth time

Enter the time shown in the birth record. The time zone comes from the location.

City, hospital, or address

London, United Kingdom

Resolving birth time…

Coordinates and time zone

Latitude

Longitude

Time in the birth record

Time zone · from location

City search selects its center. For an exact birth location, choose the hospital on the map.

Search: © OpenStreetMap contributors · Photon

When to look at the sky

Choose the date and time for the outer ring. The birth chart and its houses stay fixed.

Analysis date · UTC

Time · UTC

UTC is the same worldwide. Birth time is resolved separately using the birth place. Press Build chart after changing the date.

Additional points0 selected

Selected additional points appear in both layers and in the event calendar.

☊︎Mean north nodeAveraged lunar north node☊︎True north nodeInstantaneous lunar north node⚸︎Mean LilithAveraged lunar apogee⚸︎Osculating LilithLunar apogee of the instantaneous orbit⚷︎ChironMinor planet Chiron

Advanced settingsDE442 · Tropical zodiac

Ephemeris model

NASA data used to calculate planetary positions.

Aspect tolerance · degrees

How far from the exact angle an aspect may be. Lower values show fewer aspects.

Research comparison

Optional: calculate with both DE441 and DE442 to check their differences.

Calculation details

Each layer uses apparent geocentric tropical longitudes of its own date. Natal targets stay fixed; they are not precessed to the transit date.

Only natal Placidus houses are used. No transit location, transit houses or transit axes are inferred.

Placidus can be undefined at high latitudes. The calculation reports this explicitly; it does not silently choose another house system.

One birth chart, a moving sky

Build a double wheel, then search a chosen transit for exact passages and intervals inside an orb.

The prefilled birth details are a fictional example. Replace them with the record you want to calculate.