The point of no return (PNR or PONR) is the point beyond which one must continue on one's current course of action because turning back is no longer possible, being too dangerous, physically difficult, or prohibitively expensive to be undertaken. The point of no return can be a calculated point during a continuous action (such as in aviation). A particular irreversible action (such as setting off an explosion or signing a contract) can be a point of no return.
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👉 Point of no return in the context of Epoch (reference date)
In chronology and periodization, an epoch or reference epoch is an instant in time chosen as the origin of a particular calendar era. The "epoch" serves as a reference point from which time is measured.
The moment of epoch is usually decided by congruity, or by following conventions understood from the epoch in question. The epoch moment or date is usually defined from a specific, clear event of change, an epoch event. In a more gradual change, a deciding moment is chosen when the epoch criterion was reached.
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Point of no return in the context of Crossing the Rubicon
The phrase "crossing the Rubicon" is an idiom meaning "passing the point of no return". Its meaning comes from the crossing of the Rubicon by Julius Caesar in January 49 BC at the head of the 8th legion. Caesar was not allowed to command an army within Italy proper, and by crossing the river with his forces was defying law and risking death. The crossing precipitated the Roman civil war, which eventually led to Caesar becoming dictator for life (dictator perpetuo).
Caesar had previously been appointed governor of a region that stretched from southern Gaul to Illyricum. As his term was coming to an end, the Senate ordered him to disband his army and return to Rome. Caesar defied the order, and instead brought his army to Rome, occupying the city of Ariminum then crossing the Rubicon towards the south. The exact date of the crossing is unknown, but scholars usually place it on the night of 10 and 11 January because of the speeds at which messengers could travel at that time. The phrase iacta alea est ("the die is cast"), allegedly uttered by Caesar just before the crossing, also comes from this event.
Point of no return in the context of Alea iacta est
Alea iacta est ("The die is cast") is a variation of a Latin phrase (iacta alea est [ˈjakta ˈaːlɛ.a ˈɛs̺t]) attributed by Suetonius to Julius Caesar on 10 January 49 BC, as he led his army across the Rubicon river in Northern Italy, between Cesena and Rimini, in defiance of the Roman Senate and beginning a long civil war against Pompey and the Optimates. The phrase is often used to indicate events that have passed a point of no return.
According to Plutarch, Caesar originally said the line in Greek rather than Latin, as ἀνερῥίφθω κύβος anerrhī́phthō kýbos, literally "let a die be cast", metaphorically "let the game be played". This is a quote from a play by Menander, and Suetonius's Latin translation is slightly misleading, being merely a statement about the inevitability of what is to come, while the Greek original contains a self-encouragement to venture forward. The Latin version is now most commonly cited with the word order changed (Alea iacta est), and it is used both in this form, and in translation in many languages. The same event inspired another related idiom, "crossing the Rubicon".