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#Nourooz

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Happy #nowrooz.

The first day of spring and the Persian new year.

Just for those who don't know the scientific background of how the new year is calculated and the moment of "Sal Tahvil" (delivery of the year, or handover of the year).

#Khayyam did this in 11th century, loooong before westerners even admitted that the earth revolves around the sun.

https://arxiv.org/pdf/2410.04053

#Nourooz #NewYear #Iran #Persia #Spring #Nowruz #Science #Mathematics #Astronomy #History