Definition of "shadowless"

There is something in the shadowless sky and the unbroken moonshine which mocks us with repose. We have no part in it; our own unrest has no sympathy with the blue and spiritual horizon, whose hope is not with this life.

1834, L[etitia] E[lizabeth] L[andon], chapter XXXVIII, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), page 313

[…] fluorescent lighting has been adopted for the upper deck lounges and smokerooms, so giving shadowless lighting.

1947 September and October, “First Southern Railway Post-War Vessel”, in Railway Magazine, page 294