  We present our recent contributions to the theory of Lagrangian descriptors
for discriminating ordered and deterministic chaotic trajectories. The class of
Lagrangian Descriptors we are dealing with is based on the Euclidean length of
the orbit over a finite time window. The framework is free of tangent vector
dynamics and is valid for both discrete and continuous dynamical systems. We
review its last advancements and touch on how it illuminated recently Dvorak's
quantities based on maximal extent of trajectories' observables, as
traditionally computed in planetary dynamics.
