Jupiter-Earth Alignments
Here we compare the sidereal longitude of Jupiter and Earth, counting UFO sightings for each of 24 15-degree zones of relative position.
In Zone 12, the Sun, Earth and Jupiter are aligned within plus or minus 7.5 degrees, as close as they get, and without regard to absolute sidereal longtitude. At these times we see Jupiter at its brightest.
Zone Zero at left indicates sightings when Earth and Jupiter are on opposite sides of the sun.
The spike in zone 6 results mostly from sightings waves in June/July 1952 (USA) plus October 1954 in France.
A similar spike at zone 15 shows the effects of June/July 1947, plus several flaps combined between 1960 and 1972 for quite a coincidence.