Chronic disease is disease that persists over a long period of time. Chronic disease can hinder independence and the health of people with disabilities, as it may create additional activity limitations.hronic disease is disease that persists over a long period of time. Chronic disease can hinder independence and the health of people with disabilities, as it may create additional activity limitations.
Since the moon's orbit is elliptical (oval-shaped), its distance varies from about 221,463 miles (356,334 kilometers) at perigee (closest approach to Earth) to 251,968 miles (405,503 kilometers) at apogee (farthest point). The average distance from the moon to the Earth is 238,857 miles (384,392 kilometers).
Given a known distance, we can rearrange this relationship to solve for the time it takes to travel that distance at a certain speed. The average distance between the Earth and Moon is about 239,000 miles (384,600 km). Plugging this value and the speed of light into the above equation allows us to solve for the time it takes for radio waves to travel between the Moon and Earth, as shown below.