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The null findings of the terrestrially conducted Michelson-Morley typeexperiments have been influential to determining which physical theory bestfits reality. Here, we propose the use of parallax and ranging techniques ofdistance measurement for Michelson-Morley type experimentation on astronomicalscales, elaborating with the earth-moon system. A motivation is the bypass ofany hypothetical earth-bound medium as an explanation for the earlier nullfindings. When the solar system 370 kms-1 motion relative to the cosmicmicrowave background is taken into consideration, the higher value of receptorvelocity and the longer distance sets the stage for a confrontation betweenLorentzian and Galileo-Newton dynamical transformations. Two-way ranging timecarries along with it information about light's dynamical transformation, thusa comparison of distance measured by ranging with that by parallax, ageometrical method can reveal the correctness of assumptions underlying thedynamical behaviour of light. Two-way ranging times unaffected by the 370 kms-1velocity indicate null results and further buttress Einstein's relativitytheory, while ranging times affected by this velocity indicate non-null resultsand will manifest as a general increase of ranging distance above actualgeometric lunar distance, up to 500 metres in RA 11h 11.649m and 23h 11.649mcoordinate directions.

Proposal for combined use of parallax and lunar laser ranging for Michelson-Morley experimentation