Highlights for calcium-carbonate. CALCIUM CARBONATE (KAL see um KAR bon ate) is a calcium salt. It is used as an antacid to relieve the symptoms of indigestion and heartburn. It is also used to prevent osteoporosis, as a calcium supplement, and to treat high phosphate levels in patients with kidney disease. This drug can cause serious side effects.
Earth's orbit. Earth's orbit is the path through which the Earth travels around the Sun. The average distance between the Earth and the Sun is 149.60 million kilometers (92.96 million miles), and a complete orbit occurs every 365.256 days (1 sidereal year), during which time Earth travels 940 million kilometers (584 million miles). Earth's orbit has an eccentricity of 0.0167.
Elliptical orbit. The AU is the average distance from the Earth to the sun. Earth makes a complete revolution around the sun every 365.25 days Â­â one year. However, Earth's orbit is not a perfect circle; it is shaped more like an oval, or an ellipse.