SkyServer: GLossary
DR7 Help
 Site News
 Cooking with Sloan
 Search Form Guide
 SQL Tutorial
 SQL in SkyServer
 Sample SQL Queries
 Query Limits
 Searching Advice
 Archive Intro
 Table Descriptions
 Schema Browser
 Web Browsers
 Data Publications
 SkyServer Sites
 Contact Help Desk

central meridianThe meridian which passes through the center of the survey area, 12h 20m , defines the central meridian of a scan. The great circle perpendicular to it passing through the survey center at dec=32.8deg is the survey equator.