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.
We didnât know how big it was, and we didnât know how far away it was. We orbit the Sun at a distance of about 150 million kilometers. This number is actually an average, since we follow an elliptical path. At its closest point, the Earth gets to 147 million km, and at its most distant point, itâs 152 million km. Distances in the Solar System are so vast that astronomers use this distance as a standard for measurement, and so the average distance from the Earth to the Sun is called an astronomical unit.