An eclipse of the Moon can only take place at Full Moon, and only if the Moon passes through some portion of the Earth's shadow. The shadow is actually composed of two cone-shaped components, one inside the other.
Joints affected by rheumatoid arthritis include the small joints of the hands, legs and the cervical spine; in other cases the bigger joints like the shoulders and the knees are also affected. The effects of rheumatoid arthritis on the affected joint is failure to function making the patient have a hard time doing small things for themselves.
Secondary OA may affect any joint. OA should not be confused with rheumatoid arthritis (RA), which is an autoimmune inflammatory arthritis. RA and other rheumatoid diseases are systemic diseases with constitutional symptoms that can affect the entire body, not just the joints; in contrast, OA affects only the joints. However, RA can cause secondary OA.