Mighty bsmall thorn/b. It could be that Jupiter's effect on the heliospheric current sheet and interplanetary magnetic field turn out to be more important than the Jupiter shine on sun or earth. You brought up the Jupiter shine. b....../b Furthermore, they may be conditionally associated ? for example depending on bvacation/b-schedules of the 2 people. For the hopelessly-inattentive investigator, the time-of-day & day-of-week might collectively constitute a lurking variable. ...
