Matches in DBpedia 2016-04 for { ?s ?p "Catalog of 5,268 Standard Stars Based on the Normal System N30 is the 1952 auxiliary star catalogue created by Herbert Rollo Morgan to address proper motion inaccuracies in 19th century observations by converting contemporary catalogues from a mean epoch around 1900 (±0.1 yr) to epoch and equinox 1950.0. However, the positions were derived from more than 70 recent catalogs with epochs of observation between 1917 and 1949. The N30 system is independent from any other astrometric system."@en }
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- Catalog_of_5,268_Standard_Stars_Based_on_the_Normal_System_N30 comment "Catalog of 5,268 Standard Stars Based on the Normal System N30 is the 1952 auxiliary star catalogue created by Herbert Rollo Morgan to address proper motion inaccuracies in 19th century observations by converting contemporary catalogues from a mean epoch around 1900 (±0.1 yr) to epoch and equinox 1950.0. However, the positions were derived from more than 70 recent catalogs with epochs of observation between 1917 and 1949. The N30 system is independent from any other astrometric system.".
- Q5051307 comment "Catalog of 5,268 Standard Stars Based on the Normal System N30 is the 1952 auxiliary star catalogue created by Herbert Rollo Morgan to address proper motion inaccuracies in 19th century observations by converting contemporary catalogues from a mean epoch around 1900 (±0.1 yr) to epoch and equinox 1950.0. However, the positions were derived from more than 70 recent catalogs with epochs of observation between 1917 and 1949. The N30 system is independent from any other astrometric system.".