A move made by Euthyphro suggests another way to avoid the reductio without adopting relativism about arthood.

[…] here is the hand and seal of the duke: you know the character, I doubt not; and the signet is not strange to you.

Intervals of ephemeride time can be measured by means of observations of any celestial bodies whose orbital movements can be assumed to be governed by gravitational forces […]

Adam Schiff: Abe Mercer. Ten years ago, he was a broken-down valise. Bad divorce, partners suing him, ethics review. If Doc Gooden can rise from the dead, why not Abe Mercer?