The Unmeasurability of Absolute Velocities from the Point of View of Epistemological Internalism

Abstract Absolute velocities in Newtonian mechanics are commonly regarded as unmeasurable. Roberts (Br J Philos Sci 59(2):143–168, 2008) provides a justification for this thesis which appeals to the observational indistinguishability of boost-related models mechanics. Middleton and Murgueitio Ramírez (Australas Philos, 2020) criticise his argumentation by pointing out that analysis notion measurement is too restrictive, that, under weaker (based on counterfactuals), absolute measurable. Jacobs opposes their view, arguing properly formulated counterfactual-based account measurement, However, argument, plays no role, even though, intuitively, it very relevant issue (un)measurability. This paper’s aim bring back discussion. I build upon observation there an analogy between possible views knowledge one hand, other. In particular, explore distinction externalist internalist approaches. Counterfactual-based accounts all externalist, whereas becomes if we interested concept measurement.