> You’re telling me that you can calculate temperatures from around the world pre-1950s and trust that it’s consistent and accurate?
Consistent and within an envelope of accuracy, sure.
Today we can even compare high resolution, many measurement point global tempreture distributions against what would be projected if we only had the same stations from the 1850s - 1950s.
Recall that pre GPS navigation was highly reliant on accurate time pieces which were highly reliant on accurate tempreture, humidity, air pressure readings. From the 1850s onward there are highly reliable records from scientific grade instruments at trading ports about the globe.
Consistent and within an envelope of accuracy, sure.
Today we can even compare high resolution, many measurement point global tempreture distributions against what would be projected if we only had the same stations from the 1850s - 1950s.
Recall that pre GPS navigation was highly reliant on accurate time pieces which were highly reliant on accurate tempreture, humidity, air pressure readings. From the 1850s onward there are highly reliable records from scientific grade instruments at trading ports about the globe.