- n -

• neighbor_allows_merge() : spherical_quadtree
• neptune() : neptune
• next() : euler_solver , runge_kutta_solver , solver
• node() : node
• node_cos_angle() : spherical_quadtree
• node_radius() : spherical_quadtree
• node_relative_path() : node_relative_path
• norm() : quaternion
• normalize() : vector , quaternion
• normalize_h() : vector
• now() : julian_day