Author: Royal Greenwich Observatory.
Alternate names: Royal Greenwich Observatory; Greenwich. Royal Observatory; Royal Observatory, Greenwich.; Royal Observatory (Greenwich); Greenwich, Eng. Royal Observatory.; Greenwich. Royal Observatory.; Royal Observatory. Greenwich.; Greenwich, Eng. Royal observatory; Hurstmonceux, England. Royal Greenwich Observatory.; Hurstmonceux, Eng. Royal Greenwich Observatory; Great Britain. HM Nautical Almanac Office. Royal Greenwich Observatory.; Royal Greenwich Observatory. Nautical Almanac Office.