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).
The Moon's orbit around Earth is not a perfect circle, but elliptical, with one side closer to Earth than the other. As a result of the Moon's elliptical orbit, the distance between the Moon and Earth varies throughout the month and the year. On average the distance is about 382,900 kilometers (238,000 miles). The point on the Moon's orbit closest to Earth is called the perigee and the point farthest away is the apogee.