Light-time delay

One-way and round-trip RF / light travel time for a given range (deep-space ops). DSN two-way range is the RTLT.

SIDUS educational calculator. Category utilities. Tags: comms, mission-design, operations, RF, utilities. Pure SI. Not flight software.

Formula

t = d / c

One-way and round-trip light time

Primary sources

SI Brochure (BIPM) (BIPM): SI base units for converter categories.
Space Mission Engineering: The New SMAD (Wertz, Everett, Puschell (eds.)): Mission engineering handbook: RF links, constellations, and ops framing.
Radiometric Tracking Techniques for Deep-Space Navigation (NASA / JPL DESCANSO (Thornton, Border)): DSN two-way range, Doppler, and clock-to-range-rate. Educational SI, not a tracking system.

How do AI agents use this tool?

Read /llms.txt or call https://sidus.tools/api/mcp. Open the interactive page for live SI inputs.

Open interactive tool · SIDUS