the sun is just over the equator twice a year. How is the length of the day and night at these times? discuss why.

The lenght of the day and the night precisely on the equator is always 12 hours. in 12 hours of day and 12 hours of night. The only thing that's specific when the sun is exactly above the equator is that the sun is exactly above the equator, as in the sun is directly overhead those two days of the year.

Explanation:

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

it apply by theyre artifacts