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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MrBrownstone · 46-50, M

Light years

Zaphod42 · 46-50, M

@MrBrownstone That’s a measurement of distance, and still depends on the exact orbital experience of this planet

MrBrownstone · 46-50, M

@Zaphod42 Using TIME to see how far light travels.

Zaphod42 · 46-50, M

@MrBrownstone Yes, but what is a universal way of telling time? Someone from a different planet would have a different definition of a year, and therefore how far light can travel in that time. It’s a specific measurement that wouldn’t mean much outside of this world.