Any big brains out there know of a universal way to measure time?

Like let’s say we’ve made contact with an alien race and have figured out communications. We want to tell them a thing will happen at a specific time, but they have a different means of measurement that we can’t understand. Is there a universal constant way to measure time that doesn’t assume a standard planetary rotation, or the reactions of a specific atom to specific conditions? A constant regardless of environmental conditions that with the basic equipment of a reasonably techno-savvy civilization could easily be measured

*edit* Could the hydrogen line frequency be used as constance reference point perhaps?

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Tastyfrzz · 61-69, M

If they're moving ar a different speed then their time is different from yours.

Zaphod42 · 46-50, M

@Tastyfrzz Or if they have a stronger gravitational pull it’ll be slower, and a bunch of other variables. So I’m trying to think of a way to have a universal thing that behaves the same under most variables that can be an accurate measure of the passage of time. Like using the frequency of the hydrogen line or something 🤷‍♂️

Tastyfrzz · 61-69, M

@Zaphod42 an external pulsar

Zaphod42 · 46-50, M

@Tastyfrzz That’s kinda genius! A good strong one that can be observed from anywhere in the empire, which is something like 2000 light years across. That might be what I go with. Thanks!

Human1000 · 51-55, M

@Zaphod42 FYI, satellite speed creates this issue with global communications. Adjustments are made. If not cell phone communication would cease because of varying times.

Zaphod42 · 46-50, M

@Human1000 Well aware…GPS too