The sky at the moment you were born, drawn in fine lines and hung on the wall.
A birth chart is a map of where the Sun, the Moon and the planets stood at the moment someone was born. Here it is drawn the old way — a wheel of the twelve signs, the houses inside it, each planet marked where it was — in thin lines on charcoal or off-white.
Take away what you don’t want and keep what you do: the zodiac ring, the houses, the lines between planets, the degrees, the name underneath.
Put two charts on the same wheel and you can see where they touch: your Sun across from their Moon, their Venus beside your Mars. Each of those meetings is drawn as a line through the middle — solid where the two planets sit easily together, dashed where they pull.
It suits a couple, and just as well two best friends, a pair of siblings, a parent and a child, or two people getting married who need a present nobody else will bring.
At the moment you were born the Sun was rising somewhere, setting somewhere else and standing overhead along one line of the globe. The same is true of the Moon and every planet. Drawn on a map of the world, those lines are your astrocartography.
It starts at its quietest — your sign, the world as a field of dots and the Sun’s four lines — with the cities each line passes listed underneath. Add the other planets if you want the whole sky.
Pick a night that mattered — a wedding, a birthday, the night you met — and the town you were in. This is the sky that was over it: five thousand stars, each where it stood and as bright as it was, inside the circle of the horizon.
The constellations are joined in the thinnest line the paper will hold. The Moon is there at its phase, with any planets that were up. Take away the names, the compass points or the faint stars until it is as quiet as you want it.