Nobody since the 1940s has done these kinds of experiments, and the industry has changed a lot since then.
Which means you put it in your mouth and taste it. We get people who know the flavor of maple syrup, and off-flavors, and they try each one.
Syrup is not just concentrated sap.
The sap flow mechanism is driven almost entirely by the daily fluctuation in temperature. Any kind of change that does occur is going to impact the season.
This is for everyone who has ever looked at the stars, or gazed from atop a hill, or across the sea and wondered...