Astronomy

Shra proper is a planet, orbiting a star called Tafuyt (Tamazight for 'sun'). It is a yellow-white star with spectral class F2. It weighs 1.17 times as much as our own sun and has 1.73 times as much luminosity. Shra orbits Tafuyt at a distance of 1.23 AU, which means that it appears 1.14 times more luminous than our Sun on Earth, though Shra's clear skies make it sunny almost all year round as thus even brighter.
Shra is smaller than Earth, with only 60% of its mass and 83% of its radius. So on average the planet is 1.05 times denser, due to a higher percentage of heavy elements in its core and mantle. The surface gravity is 87% of that on Earth.
Like our planet, it has a nearly circular orbit and also like Earth, its axis is tilted relative to its orbit. The axial tilt is somewhat less, only 19.6°.
Shra rotates around its axis in 17.6 Earth-hours and completes an orbit around Tafuyt in 460 Earth-days, i.e. 628 Shra-days. There are days and years but no months as Shra has no moons.

Geology

Shra has a surface area of 351 million km², all of it land, none of it sea. Because its smaller size, the planet loses heat more rapidly than Earth. However it is younger than our 4.5 billion years old planet, making its level of geological activity on slightly less.

Because rainfall is very scarce, erosion by water flows is minimal. Apparently only winds and dust chafe the rocks, causing deflation and abrasion. The main weathering agents are the rainfall, however little, and the cycles of thermal expansions and contractions. Because the weathering is slow, the mountains in Shra tend to grow to great heights and appear like giant jagged peaks rather than mellowed hills.

The planet has a fragmented crust over a mantle of molten rock, plus plate tectonics, just like Earth. However there are no oceans; both thin and thick plates are land-based. The sparse water supplies keep life to a minimum. Therefore there is little sedimentary rock on Shra. Most rock is metamorphic, some igneous.