Astrocartography
Your birth sky, drawn across the world
At the moment you were born, every planet was directly overhead somewhere, and rising on the horizon somewhere else. Draw those places as lines and you get this map. Where a line runs is where that planet was at its most angular for your birth moment, and astrologers read it as the place that planet is loudest for you.
What the lines are, exactly
The straight ones are easy: a planet is overhead along one line of longitude, and at the opposite point on the far side, so its Midheaven and IC lines are meridians. The curved ones are where it takes real work. A planet rises at different longitudes depending how far north or south you stand, so the rising line bends, and near the poles it stops existing altogether because the body never rises at all. Those curves are sampled every quarter degree of latitude rather than drawn between two endpoints, which is the difference between a map and a decoration.
What this does not do is tell you where to live. A line across a city is a symbolic claim about that place and your chart, not a fact about the place, and moving is expensive enough that it deserves better reasons than a line on a map.
What this calculation assumes
- version
- asternym-astrocartography-v1
- bodies
- Ten: Sun, Moon and Mercury through Pluto
- angles
- Four per body: MC, IC, ASC and DSC, so forty lines in all
- mcIc
- Meridians, drawn as straight lines of longitude
- ascDsc
- Curves, sampled every quarter degree of latitude rather than interpolated between endpoints, and cut off at the latitudes where a body no longer rises or sets
- frame
- Equator and equinox of date, with apparent positions
- requiresBirthTime
- An exact birth time is required. The lines move about fifteen degrees of longitude an hour, so an estimated time puts them in the wrong country
- parans
- Not computed