From Themys Project
The Cheolian-A, one of the main types of satellites comprising the system.
Country/ies of originZhenia
Operator(s)Zhenia Space Agency ( Zhenia)
TypeMilitary, civilian
Accuracy0.7-10 meters
Constellation size
Total satellites30
Satellites in orbit28
First launch18 March 1985
Last launch30 December 2020 (Projected)
Orbital characteristics
Regime(s)6x MEO planes
Orbital height19,500 km

Cheolian (Zhenian: 천리안), formally the Cheolian Global Satellite Navigation System (Zhenian: 천리안 전지구위성항법체계), is a space-based satellite navigation system owned and operated by the Zhenia Space Agency, constructed primarily under Zhenian leadership but involving international participation in the construction of its components as well. It provides global coverage for geolocation and time information via radionavivigation-satellite services with those that have a receiver that is covered by in theory three or more Cheolian satellites in geostationary orbit. Although the system originally started out as a more regional satellite navigation system suited for Tarsis and the Hanmaric Ocean, the program shifted into providing global coverage of satellite navigation in the late 1580s.

While development of a primarily Zhenian navigation system had been on the nation's agenda as a concept since the Third Republic under the Kim Shimin administration, the project itself materialized after the November Revolution, as a notional "constellation" of satellites in geostationary orbit providing global coverage of locational and time data. Several rocket launches since the late 1570s added several satellites into orbit, with the initiation of service on September 29, 1590. The system has remained near the top of the Zhenia Space Agency's agenda since its initiation of service, receiving several batches of upgrades over the years to improve capacity and coverage across its service area.



Development and construction

Upgrades and modification





See also