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.
(hÉ-rÄ«'zÉn) 1  The apparent intersection of the Earth and sky as seen by an observer. Also called apparent horizon. 2  Geology. A specific position in a stratigraphic column, such as the location of one or more fossils, that serves to identify the stratum with a particular period.