# Kālakriyāpāda III.6 — lunar months named by nakshatra, and why adhimāsa is needed
model.geocentric
reset
show.bodies
show.moon
show.constellations
show.eclipticBelt
division.set nakshatra
show.divisions
now
overlay.show The ecliptic divided into 27 nakshatras — the division the lunar months take their names from
overlay.show A month is named for the nakshatra the full Moon falls in: Chaitra, Vaiśākha, and so on
wait.next Walk thirteen months

overlay.clear
speed.set 8
repeat 13
  play.until.full-moon
  overlay.clear
  overlay.show {date} · month {moon.month} · {moon.nakshatra}
  wait 0.9
end
pause
overlay.clear
overlay.show Thirteen full moons ran past — but a solar year holds only twelve months
wait.next Why the extra one?

overlay.clear
overlay.show Twelve lunations come to about 354 days; the solar year is about 365
overlay.show That eleven-day shortfall accumulates, and in roughly 32 months it adds up to a whole month
overlay.show A thirteenth month — the adhimāsa — is inserted to absorb it and pull the calendar back to the seasons
overlay.show Without it the festivals would walk backwards through the year, as they do in a purely lunar calendar
wait.next Done

overlay.clear