What does a steady green light directed at an aircraft on the ground indicate?

A steady green light directed at an aircraft on the ground indicates that the aircraft is cleared for takeoff. This signal is part of the standard light gun signals used by air traffic control to communicate with pilots when radio communication is not possible. The green light specifically communicates permission for the aircraft to commence its takeoff procedure, allowing the pilot to proceed safely onto the active runway and take to the skies. Understanding this signal is crucial for pilots, as it helps ensure safe operations in the airport environment.