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.
Why are people with RA at increased risk? In RA, bone may be affected by structural joint damage (erosions) and osteoporosis. The causes of osteoporosis associated with RA are numerous and include the effects of chronic inflammation, the effects of medication and lifestyle factors.