Нульмĕш меридиан

Нульмĕш меридиан, Гринвич витĕр иртет.

Primemeridian

Литература

• Burgess, Ebenezer (2013), "Translation of the Surya-Siddhanta", Journal of the American Oriental Society, vol. 6, Google, p. 185 

• Dolan, Graham The Greenwich Meridian before the Airy Transit Circle. The Greenwich Meridian (2013).

• Dolan, Graham WGS84 and the Greenwich Meridian. The Greenwich Meridian (2013).

• Hooker, Brian (2006), A multitude of prime meridians, <http://zeehaen.tripod.com/unpub_2/multitude_meridians.htm>. Проверено 13 Кӑрлач уйӑхӗн 2013.  Архиври копи, 26 Авӑн уйӑхӗн 2018 Wayback Machine çинче
• Norgate, Jean and Martin (2006), Prime meridian, <http://www.geog.port.ac.uk/webmap/hantsmap/hantsmap/meridian.htm>. Проверено 13 Кӑрлач уйӑхӗн 2013.  Архиври копи, 4 Утӑ уйӑхӗн 2013 Wayback Machine çинче
• Sobel, Dava & Andrewes, William J. H. (1998), The Illustrated Longitude, Fourth Estate, London 

Каçăсем

• «Where the Earth’s surface begins—and ends»2016 ҫулхи Ҫу уйӑхӗн 2-мӗшӗнче архивланӑ., Popular Mechanics, December 1930
• scanned TIFFs of the conference proceedings2006 ҫулхи Утӑ уйӑхӗн 14-мӗшӗнче архивланӑ.
• Prime meridians in use in the 1880s, by country
• Canadian Prime Meridian2014 ҫулхи Ҫурла уйӑхӗн 29-мӗшӗнче архивланӑ.