๐Ÿ“ก Deep-Space Communications Planner

Turn range into one-way light time, round-trip conversation delay, file-transfer finish time and free-space path loss. Useful for planning when a crew cannot wait for real-time help from Earth.

Illustrative ranges ยท actual geometry changes continuously
One-way light time
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Signal round trip
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Earliest considered reply
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Last file bit arrives
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Vacuum light time uses c = 299,792.458 km/s. Free-space path loss excludes antenna gain, pointing, atmosphere, noise, coding and hardware losses; data time excludes protocol overhead and outages.