The celebration of mankind and the valuing of empirical knowledge and the study of the natural world is known as what?

The celebration of mankind and the valuing of empirical knowledge and the study of the natural world is known as science.

Explanation:

Science is the knowledge of the natural world, of the world of nature. The natural world is studied by the empirical, theoretical, and practical knowledge which is also known as the body of science. Humankind needs to recognize the regularities in nature for survival.

Development of science is necessary to study and understand the world around us. Science have helped us to understand the movements and motions of the Sun and the Moon, the cycle of day and night, the seasons and so on.

the longest time is 123 years