From: Measuring the stability of fundamental constants with a network of clocks
Measurement type
|dln(α)/dt|/yr
Reference
Yb+ clocks
∼10−18
[20]
Oklo phenomenon
∼10−17
[154–157]
Meteorite dating
∼10−16
[158]
MICROSCOPE (indirect limits)
∼10−17–10−23
[14, 137, 138]