1.4 Additional Information CMS is committed to maintaining the integrity and security of health care data in accordance with applicable laws and regulations. Disclosure of Medicare Beneficiary eligibility data is restricted under the provisions of the Privacy Act of 1974 and HIPAA.
horizon-the line at which the sky and Earth appear to meet. apparent horizon, sensible horizon, visible horizon, skyline. linear perspective, perspective-the appearance of things relative to one another as determined by their distance from the viewer.
What appears on a map or flat surface as a straight line is not the shortest distance between two points. This is because the earth is not flat, but is a sphere. Thus the shortest distance between two points on a sphere is an arc rather than a straight and constant heading. This arc is called the great circle route.