set landing_arc to 97.//experimentally determined value
set ksc_longitude to -74.8.
set ship_omega to constant:radtodeg * sqrt(ship:body:mu/ship:orbit:semimajoraxis^3).
set body_omega to constant:radtodeg * 2*constant:pi / ship:body:rotationperiod.//compensating for the rotation of kerbin
set arc_remaining to (ksc_longitude-landing_arc-ship:longitude).
if arc_remaining < 0 {set arc_remaining to arc_remaining + 360.}
add node(time:seconds+arc_remaining/(ship_omega-body_omega), 0, 0, -80).

run exec.
run landing.