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When communicating at distance in space (such as Earth communicating to a craft orbiting Mars), the communication experiences a time delay. My research indicates this delay maybe called "One-Way Light Time" (OWLT) or One-Way Speed of Light Time: https://en.wikipedia.org/wiki/One-way_speed_of_light

Is this the correct term and does it cover extreme distances as well, such as covering distances between solar systems, across the milky way, etc?

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  • $\begingroup$ In Sci-Fi this concept is often shortened to "light lag" which I think is a rather concise term (the only ambiguity being if it is round-trip or one-way lag). For example, someone might say, "The light lag of one second between Earth and the moon makes conversation uncomfortable." $\endgroup$ – Dragongeek May 19 at 17:17
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NASA's Deep Space Network calls it round-trip light time.

round-trip light time

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Earth-bound communications & networking engineers often speak of "latency."

https://www.dictionary.com/browse/latency?s=t (see definition 4.)

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