# Golapāda IV.18–21 — the observer's reference circles
reset
view.outside
observer.city Ujjain
show.horizon
show.cardinals
wait 1

show.meridian
overlay.show Meridian (yāmyottara) — the N–S circle through the zenith
wait 3

show.east-west
overlay.show Prime vertical (samamaṇḍala) — the E–W circle through the zenith
wait 3

show.celestial-equator
show.six-hour-circle
overlay.show Unmaṇḍala — the 6-hour circle, where the equator rises and sets
wait 4

show.zenith
show.nadir
overlay.show Horizon (kṣitija), zenith, and nadir complete the local frame
wait 4
overlay.clear