3rd from primary
1,402,480,031 km (9.375 AU)
|Cities and towns|
- "Sihnon isn't that different from this planet. More crowded, obviously, and I guess more complicated. The great city itself is; pictures can't capture it. It's like an ocean of light."
- ―Inara Serra
Along with its sister planet Londinium, it is amongst the most prominent of the Central Planets. Those who visit the planet often describe it as one of the most beautiful locations in the system, reaching a level of sophistication seldom seen throughout the 'Verse.
Sihnon is the seat of Eastern civilization in the Union of Allied Planets. It is here that many Registered Companions undergo their training in the spiritual and physical arts they are known for. Sihnon is also home to Ching Shian University, a prestigious school that has alumni ranging from prime ministers to billionaire philanthropists. There is no better place to study Eastern philosophy, history, law or culture.
Sihnon's preservationalist attitude has caused the government to restrict large vessel traffic to equatorial zones.
- Sinon helped design the Trojan Horse.
- In the episode "Serenity," Inara pronounced Sihnon as SEE-non (with the "I" pronounced as a strong "E" and the emphasis on the first syllable), but in the episode "Heart of Gold," Nandi pronounced Sihnon as sih-NON (with the "I" pronounced as a soft "I" and the emphasis on the second syllable).
- In the CoDominium series Sparta is the colony world for the United States and Europe. St. Ekaterina is the colony world for Russia and Asia. Londinium is the colony for the United States and Europe. Sihnon is the colony world for Asia.