Sirian Planet

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Map of sirian planet, one contiguous continent
Ship approaching a planet with a small moon inside a nebula

Planet Sirian
Radius: 5,922km
Volume: 8.7e11 km3
Mass: 4.8e24 kg
Average Density: 5.5 g/cm3
Surface Gravity: 9.17 m/s2

Sirian is the second planet from its sun, Boros. At .9 AU, its solar year is 85% the length of an Earth year, with its rotation giving it a day slightly shorter than 24 hours. Sirian is a terraformed world. While the planet is approximately 2.5 billion years old, its biological diversity is more similar to a planet twice its age. The planet is still extremely active tectonically, resulting in frequent earthquakes. Geological records suggest Sirian was terraformed between five and twenty thousand years ago, although archeological evidence suggests these numbers may not be accurate. The precise purpose or methods of terraforming are still unknown. There is still simple life active primarily in Sirian's oceans representing the native life, but otherwise all life on Sirian is of the introduced genetic stock.

Sirian is dominated by a single supercontinent, approximately 75 million km2, covering 17% of the planet’s surface, shaped as a crescent open to the west and with mountain ranges along the east coast. The remainder of the planet is covered with ocean, dotted by archipelagos and small islands. The planet is largely temperate, with wide variations in temperature over short periods. Its weather systems are defined by megamonsoons, which cause months of rainfall and flooding over the summer followed by dry winters. Weather is especially violent on the ocean-side of mountain ranges, and deserts dominate the land-side. The planet's low atmospheric pressure permits winds to reach higher speeds with the same power, and weather systems push further in land than comparable on Earth. Most cities establish themselves near the coast of the inner western sea, or near rivers.

Sirian has two natural moons; Philipees and Ardiel. Because of their gravitational effects, the tides of Sirian show wide variations, and the seasonal megamonsoons are frequently increased in strength.

Boros’s location at the edge of the nebula results in most of Sirian’s night sky being a haze, with most distant stars occulted. Given the frequency of extraterrestrial visitations, it is supposed that the nebula also protects Sirian from view of an otherwise populous galactic neighborhood. Sirian is struck by asteroids or comets greater than 1 km in diameter approximately every 200,000 years.

The Ocean

On the Sirian World there is a single massive body of water, named ‘the Ocean’. With only one landmass the ocean is divided into sections. For example there is the Western Ocean, North Western Ocean, and Northern Ocean and so forth. From the Bolivnian Satellite Port City on the Eastern Coast to the Caldar Port City on the Western Coast the journey is roughly 14 days by cruise ship with a small Island Chain in the middle dividing the Eastern and Western Sea.

The Outer Islands

The outer islands are a location mostly mapped by satellite and aerial photography. The islands are difficult to approach with a reputation for destructive reefs, troublesome currents, instrument malfunction, fogs and disappearing ships. Even aircraft have been subject to the malfunctions (as reputation has it). Otherwise there seems to be little on the islands of interest, and few nations are concerned with claiming the territory.

Main Landmass

The Rohearn Subcontinent is a lush territory with a wide variety of different terrains, owing to its distance from the planet's equator and subsequent temperate climate. This region is controlled by the city-states, a large group of nations holding smaller territories than they would like and larger grudges.

The Jahond Subcontinent is the location of Sirian City and the major Dalhan strongholds. The Jahond has been the location of the largest conflicts of the past two hundred years, as the Rohearn and the Dalhan compete for resources and power.

The Southern Continent comprises the southern half of the Sirian landmass. It is largely grassland with very little lush vegetation, except in the extreme south, where jungles, rainforests, and swamps can be found. Within these grasslands, a number of smaller settlements exist, including the ruins of several former cities that were destroyed by the north over the last few hundred years.

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