Introduction

The zodiacal light is sunlight scattered by the cloud of interplanetary dust particles. The plane of symmetry of zodiacal light contains the information for the spatial distribution of the zodiacal dust cloud, and hence the dynamical evolution of the interplanetary dust particles. The previous observations of zodiacal cloud in the inner solar system [1] show that the observed plane of symmetry of zodiacal light is close to the orbital plane of Venus (i = 3°.4,17 = 76°.7), while those outside a solar distance of 1 AU indicate it is close to the invariable plane of the solar system (i = 1°.6,17 = 107°), where i and fl are inclination and longitude of ascending node of the plane of symmetry, respectively. In Table 1, the values of i and 17 are summarized based on the previous observations. Figure 1 shows the geometry of the plane of symmetry, relative to the ecliptic plane, and the sky region of our observation.

Table 1

The i and 17 for the symmetry plane deduced from the visible observations.

Table 1

The i and 17 for the symmetry plane deduced from the visible observations.

method

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