Coba jelasin Bacaan lanjutan dari Observatorium Kerajaan dong

Greenwich Observatory: ... the Royal Observatory at Greenwich and Herstmonceux, 1675-1975. London: Taylor & Francis, 1975 3v. (Vol. 1. Origins and early history (1675-1835), by Eric G. Forbes. ISBN 0-85066-093-9; Vol. 2. Recent history (1836-1975), by A.J. Meadows. ISBN 0-85066-094-7; Vol. 3. The buildings and instruments by Derek Howse. ISBN 0-85066-095-5).

Greenwich Time and the Longitude. London: Philip Wilson, 1997, by Derek Howse. ISBN 0-85667-468-0.