This is a common convention for annotating historical timelines. Even completely unrelated fields like Relativity routinely places time on the y-axis.
Please take your snark elsewhere.
Please take your snark elsewhere.
We all create a mental model of time at some point in our life, and then stick to it - often without ever talking about it to anyone.
But the representations vary substantially between people. Many people might have a timeline where the past is on the left and the future is on the right - maybe along the reading direction. But for some, future expands to the left. For others, future expands in front of them while the past is behind them (quite inconvenient).
It can make for a great party conversation to explore each others‘ timelines.
If there are parties, that is.