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Welcome to Tech News briefing it's Tuesday Tuesday, August 13th. I'm Zoe Thomas for the Wall Street Journal.

What time is it on the moon? It may seem like a straightforward question, but it's actually tricky to figure out and super important in the

race to get humans back to the lunar surface.

And then, efforts by Washington to ban Chinese-made drones are meeting resistance from police departments, rescue workers, and others.

They argue drones from U.S. competitors just aren't as good as drones made by Chinese company DJI.

We'll tell you about the fight.

But first, if you placed a clock on the Earth and the Moon and started them at exactly the same time,

after 24 Earth hours, the clock on the Moon would be at least 56 microseconds ahead because time is affected by

gravity and no matter where you are in the cosmos navigation depends on precise

timekeeping.

NASA has been called on to establish a lunar time scale

to make missions safer as space gets more crowded.

...