Antiscia

The fuller picture

The geometry is simple and it is a real physical relationship rather than a symbolic one. Reflect a degree across the solstice axis and you land on the degree that shares its declination — the two points sit the same distance from the summer solstice, so the Sun stands at the same height in the sky on both of the two days. In longitude the calculation is 180° minus the planet's position. That pairs the signs off predictably: Gemini with Cancer, Taurus with Leo, Aries with Virgo, Pisces with Libra, Aquarius with Scorpio, Capricorn with Sagittarius. A planet at 10° Aries has its antiscion at 20° Virgo, and anything sitting there is quietly joined to it.

What the contact means is agreement. Shared declination is read as sympathy, so an antiscion contact behaves like a conjunction: the two parties are connected, and whether that is good news depends on which two parties they are, exactly as a visible conjunction does. The value of the technique is that it finds connection where the ordinary aspect set finds none. Two significators with no Ptolemaic aspect between them normally means nothing is in train — and an antiscion contact between those same two planets says something is in train after all, out of sight.

A word about how settled this is, because it varies by claim. The technique itself is genuinely traditional and not a modern import; Lilly gives it its own treatment and it is standard in the seventeenth-century English material. The specific equivalence, though — antiscion reads as a conjunction, its opposite number reads as an opposition — is asserted in the practice we follow without any authority named for it, and the register that tracks our source's citations logs it among a run of unattributed claims. Take it as the working convention it is. What is not in doubt is that the tradition treats a tight antiscion contact as a testimony worth having.

Tightness is the whole discipline here. An antiscion is a point, not a body, and a mirror point loosely near a planet is not a contact — you want it inside a degree or so. Our own code is a fair illustration of how unsettled the exact allowance is: three different files compute antiscion hits at three different orbs, two degrees, one and a half, and one. That spread should tell you not to hang a judgment on a hit at the wide end. The other reason to be careful is arithmetic: because the calculation reflects rather than rotates, every planet has an antiscion, so a chart of seven bodies plus twelve cusps offers a great many chances for something to land somewhere. A contact between the two planets your question actually turns on is testimony; a contact between bystanders is a coincidence with a name.