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Episode: Houston We Have a Podcast, episode 419, "Telling Time on Other Worlds" (NASA Johnson Space Center, released 2026; recorded 10 March 2026). Host Dane Turner, guest Kevin Coggins.
Audio: https://www.nasa.gov/podcasts/houston-we-have-a-podcast/telling-time-on-other-worlds/ (NASA content is generally not copyrighted; credit NASA). Transcribed from the public audio on our machine, then proofread; names checked against NASA's published transcript. Not affiliated with NASA.

CHAPTERS (paste into the YouTube description; first chapter at 00:00, each at least 10 seconds, as YouTube's help requires)

00:00 Welcome: what time has to do with gravity
01:06 Kevin Coggins and what NASA's SCaN program does
03:56 Why timekeeping is the “magic question”
06:03 How Earth time is made: atomic clocks, pulsars, leap seconds
09:19 Why a nanosecond matters: 477 microseconds and 143,000 km
10:51 The Moon's 29.5-day day, and why mission time is not enough
12:24 Apollo wristwatches, Mission Elapsed Time and GPS on the Shuttle
16:43 What a coordinated lunar time needs; Curiosity's team on Mars time
19:27 Linking a lunar reference frame to Earth's
21:59 A point is a point: defining coordinates on the Moon
25:09 How many clocks, where, and surviving the lunar night
27:54 The solar-flare scenario: positioning as a safety system
29:53 Does temperature change time?
31:59 Earth time, Moon time, Mars time
33:41 The 2024 White House tasking and LCRNS progress
34:51 Is the math done yet?
37:08 Other uses: precise sampling and autonomous return trips
39:48 Mars: mission time and a 4-to-44-minute delay
42:54 Wrap-up and credits