E397 -- Expositio methodorum, cum pro determinanda parallaxi solis ex observato transitu Veneris per solem, tum pro inveniendis longitudinibus locorum super terra, ex observationibus eclipsium solis, una cum calculis et conclusionibus inde deductis

(Exposition of methods, not only for determining the parallax of the sun from an observed transit of Venus across the sun, but also for finding longitudes of places on the earth from observations of eclipses of the sun, together with calculations and conclusions deduced therefrom )

This is actually the joint title of four treatises with separate titles, namely: Summary:

It is indicated in the “Summarium dissertationum” that all of these were written by Euler.

They were probably presented to the St. Petersburg Academy before August 20, 1770.

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