  Telescopes mounted with polarizers can study the neutral points of the Earths
atmosphere, the solar corona, the surface of planets/moons of the Solar System,
distant stars, galaxies and nebulae. These examples demonstrate well that
polarimetry is a useful technique to gather astronomical information from
spatially extended phenomena. There are two enigmatic celestial objects that
can also effectively be studied with imaging polarimetry, namely the
Kordylewski dust clouds (KDCs) positioned around the L4 and L5 triangular
Lagrangian libration points of the Earth-Moon system. Although in 1961 the
Polish astronomer, Kazimierz Kordylewski had observed two bright patches near
the L5 point with photography, many astronomers assume that these dust clouds
do not exist, because the gravitational perturbation of the Sun, solar wind and
other planets may disrupt the stabilizing effect of the L4 and L5 Lagrange
points of the Earth and Moon. Using ground-born imaging polarimetry, we present
here new observational evidence for the existence of the KDC around the L5
point of the Earth-Moon system. Excluding artefacts induced by the telescope,
cirrus clouds or condensation trails of airplanes, the only explanation remains
the polarized scattering of sunlight on the particles collected around the L5
point. By our polarimetric detection of the KDC we think it is appropriate to
reconsider the pioneering photometric observation of Kordylewski. Our
polarimetric evidence is supported by the results of simulation of dust cloud
formation in the L5 point of the Earth-Moon system presented in the first part
of this paper.
