Actually, all the concepts now in what you call Islam were in Iran under different names, that Salman used and became an apostate, even though his father was the Mobed-e Mobedan.
Arabs had their own spiritualism well before Islam, and Salman's attack killed all their Astrologers and Spiritualists first, before he attacked and burnt all our books as well.
Celebrating the position of the Earth has cosmological/astrological meanings that remain in ancient Iran, and are used by contemporary Astrologers now. We were the first to devise a system based on space-time that was truly universal. Our mathematics is second to none.
Please think out of the box.