Limestone, yeah limestone.
D. The new electric potential energy is 1/2as strong as the original
electric potential energy.
<span>The Earth’s orbit is a nearly circular ellipse.
</span><span>The Sun is located at one of the two focal points.</span>
The Earth moves around the Sun in an orbit that is almost but not quite circular. As Kepler proved in the seventeenth century, the orbit is actually an ellipse. A parameter called the eccentricity (e) defines the degree of departure from a circle. A value of e=0 would indicate a circle whereas a value of e=0.9 would indicate a very elongated ellipse. The eccentricity of the Earth's orbit is currently e=0.0167.
Polaris is near the North Celestial Pole and nowhere near the Ecliptic. The Moon's orbit is tipped by 5 degrees to the Ecliptic. An eclipse can only happen when the Moon is near the line of nodes.
