In this paper a parameter was used, viz., the average difference between the heliocentric longitudes (ADL) of the planets Venus, Earth, and Jupiter. For the minimum ADL (the planets are in conjunction), as well as at the minimum deviation of the planets from a line passing through them and the Sun at the location of the planets on opposite sides from the Sun, an index was composed that uniquely describes the 11 year cycle of solar activity.Keywords: the average difference of heliocentric longitudes of planets, conjunction of planets, envelope curve of minimum values, frequency spectra, center of mass of the Solar system, solar activity.
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