Question

why is 10th May also known as Autumn Day​

Answer 1

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The10th may is considered as “Autumn Day” in South Africa as this day is marked as the establishment of South Africa’s first democratic, non-racial government. Many international leaders gathered on South African soil on this day to witness the event.  

The African National Congress president Nelson Mandela sworn in as South Africa’s first black president after being unanimously elected by the parliament.

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Answer 2

As South Africa is in the southern hemisphere so it is autumn season there.

I think so that it helps you