Explanation:

In his autobiography "Long Walk to Freedom," Nelson Mandela describes 10th May, 1994 as an autumn day in South Africa. Here's why:

- South Africa is located in the Southern Hemisphere, which means that its seasons are opposite to those of the Northern Hemisphere.
- Autumn in the Southern Hemisphere occurs between March and May.
- On 10th May, 1994, South Africa was in the midst of its autumn season.
- Mandela's reference to the day as an "autumn day" is a literary device that conveys a sense of change and transition.
- Autumn is a time of transition between the warmth of summer and the cold of winter. Similarly, South Africa was in a period of transition during Mandela's presidency.
- Mandela's use of the term "autumn day" also implies that the country was entering a new phase of its history, much like the changing of the seasons.

Conclusion:

In conclusion, Mandela's reference to 10th May, 1994 as an "autumn day" in South Africa is a metaphorical representation of the country's transition and change during his presidency.

10th May "autumn day ''in south africa because in these day non racial and democratic government was installed. In autum season the old leaves fall down and new leaves are come on tree..