# Golapāda IV.37–46 — an eclipse falls only when the syzygy lands on a node
model.geocentric
reset
show.bodies
show.moon
show.moonNodes
show.connectors
show.eclipticBelt
show.constellations
show.sunPointer
now
overlay.show An eclipse needs two things at once: a syzygy, and a node
overlay.show A full or new Moon alone will not do it — most of them pass above or below the line
wait.next Take me to a lunar eclipse

jump.lunar-eclipse
overlay.clear
overlay.show {date} · lunar eclipse · Saros {eclipse.saros} · {moon.node}
overlay.show Full Moon, and sitting on the node — so the Earth's shadow can reach it
wait.next Now a solar one

jump.eclipse
overlay.clear
overlay.show {date} · solar eclipse · Saros {eclipse.saros} · {moon.node}
overlay.show New Moon at a node this time, so the Moon's own shadow reaches the Earth
wait.next What does that tell us?

overlay.clear
overlay.show Same geometry, two orders: shadow cast onto the Moon, or cast by it
overlay.show This is why the texts name Rāhu and Ketu in the eclipse rules — they mark the only two places it can happen
wait.next Done

overlay.clear