The diurnal motion of the earth was hardly suspected until a hundred years later.
"Great Men and Famous Women. Vol. 5 of 8" by Various
OF THE DIURNAL MOTION OF THE EARTH AND PLANETS.
"Conversations on Natural Philosophy, in which the Elements of that Science are Familiarly Explained" by Jane Haldimand Marcet and Thomas P. Jones
The apparent direction of the WIMP ﬂux should be correlated with that of the motion of the sun around the galaxy, and have, in addition to the annual modulation, a diurnal modulation as the laboratory follows the earth rotation on its axis.
Direct search for WIMP dark matter