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).
When the Moon is away from Earth, it is called apogee. At apogee, the distance of the Moon from Earth is 406,300 km (252,463 mi). The average of these two distances gives the actual Lunar Distance, 384,400 km (238,855 mi). The time taken by light to travel this distance is 1.26 seconds. Lunar distance has some significance in astronomy.