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1998, Hermann Bondi, Miranda Weston-Smith, editors, The Universe Unfolding, Clarendon Press, page 384:
This gives the futurelight cone of the event. Similarly, you can define the pastlight cone—as the history of a spherical shell of light converging in on the event. All these spatial spheres, past and future, represent cross-sections through the space–time light cone, […]
Used other than figuratively or idiomatically: seelight, cone.
