# Golapāda IV.28–32 (& Gaṇitapāda II.13–16) — the gnomon (śaṅku) and its shadow
reset
scene.shanku-yantra
observer.city Ujjain
overlay.show Śaṅku — a vertical gnomon standing on level ground
wait 2

show.gnomon
show.shadow-arcs
show.sun-path
overlay.show The shadow-tip traces the day; the arcs mark the zodiac months on the floor
wait 3

# run part of a day and watch the shadow swing
jump.next.sunrise
speed.set 6000
wait 5
speed.real-time

jump.next.local-noon
overlay.show Shortest shadow at local noon — its length gives the Sun's meridian altitude
wait 4

# amplitude (agrā): where the Sun meets the horizon at rising
view.desktop
view.look east
jump.next.sunrise
overlay.show Agrā — the Sun's amplitude, its rising point measured from due east ({sun.az}°)
wait 4
overlay.clear