The time it takes for light to travel around the Earth depends on the circumference of the Earth and the speed of light.
The circumference of the Earth is approximately 40,075 kilometers (24,901 miles) at the equator.
The speed of light in a vacuum is approximately 299,792 kilometers per second (186,282 miles per second).
To calculate the time it takes for light to travel around the Earth, we can divide the circumference of the Earth by the speed of light:
Time = Circumference / Speed of light
Time = 40,075 km / 299,792 km/s
Calculating this, we find that it takes approximately 0.133 seconds for light to travel around the Earth once.
It's important to note that this calculation assumes a simplified model where the Earth is a perfect sphere and the speed of light is constant throughout the entire path. In reality, the speed of light can vary slightly due to factors such as the Earth's atmosphere and gravitational effects. However, for most practical purposes, this approximation provides a reasonable estimate.