astro-transit-window-boundarieslisted

# Transit Window Boundaries **What this is.** A discipline for reporting *when* — when a transit begins, when it is exact, when it ends. It is arithmetic on ephemeris positions, and it can be got wrong in ways that are invisible to the person receiving the answer. **What this is not.** It says nothing about what a transit *means*. Meaning is not computed here and this skill will not supply it. Load `astro-six-element-lens` if you want an interpretive layer that declares itself as one. The separation is the point: **the arithmetic can be right or wrong, and that is checkable. The meaning cannot be checked the same way.** Collapsing them is how a defensible calculation becomes an indefensible claim. ## When to Use - someone asks when a window opens, closes, or peaks - you are about to say *this period is favourable for X* — the timing half of that sentence belongs here - you are writing a script that scans transits and reports boundaries - a previous answer gave one edge of a window and you are about to give the other Do **not** load this when the question is what a period *means* rather than when it begins. Meaning belongs to `astro-six-element-lens`, and that skill carries RESONANCE — this one is arithmetic and is checkable. ## The five failures ### 1. Reporting one edge A window has two. If you scan forward from *now*, you get the exit and nothing else — and the entry gets supplied by symmetry, by intuition, or by silence. **Scan backwards as well.** If the entry w