Together, the gravitational pull of the moon and the sun affect the Earth’s tides on a monthly basis. When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides — both commonly called spring tides.
Tidal Variations - The Influence of Position and Distance Together, the gravitational effects of the moon and the sun affect the Earth’s tides on a monthly basis. The elliptial orbits of the moon around the Earth and the Earth around the sun have substantial effects on the earth’s tides.
thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.
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