Epic of Serinor: Arcane Dawn
Serinor is a small world with a diameter of approximately 900 miles (roughly 1/10 the size of Earth, or 1/3 the size of Earth’s moon.) Its equatorial circumference is 2800 miles; at normal sailing speeds and assuming a ship could sail directly along the equator, a trip by boat around Serinor would take less than a month. Even with its small size, gravity remains Earth-normal. This is due to elemental and magical forces understood only by the fairies. Indeed, no other race would think to even ask questions about gravity, since they have nothing to which to compare it.
The most significant geological features of Serinor are the void mountains. Due to Serinor’s small size, even modest mountains can quickly rise above the troposphere and into the airless expanse known as The Void. The effects of high altitude begin to set in around 1000 feet above sea level. Journeys at eleveations above 2000 feet require some sort of magical protection against the environment; not even the most powerful magic can long save an explorer beyond 3000 feet, and many mountain ranges easily exceed this height. The continents of Serinor are criscrossed by these mountain ranges, creating individual weather cells and compartmentalizing much of the land in the world.
Sea levels on Serinor are relatively low, as most water is locked within the planet’s massive ice caps. Global sea cover accounts for approximately 50-60% of the surface area (as opposed to Earth’s 80%.)
Serinor is a cold planet. The polar ice caps extend hundreds of miles outside the Arctic and Antarctic Circles. Populations tend to gather at sea level around the equator or in the tropics, which can still see noticeable cold seasons.
Serinor sees moderate seasonal variations in temperature. In the northern hemisphere, winter lasts from January through March, and summer stretches from July through September. These seasons are reversed in the southern hemisphere. Summers are mild and winters fierce.
A year in Serinor lasts 364 days, divided into twelve months. January, April, July, and October have 31 days, and all other months have 30. A week has seven days, and each day has 24 hours. Any given date during the course of the year is always the same weekday from year to year.
The first day of each season corresponds with its related solstice or equinox, which happen on the first day of the long months. Midwinter is observed on February 15, and Midsummer on August 15. Midspring and Midautumn are not typically recognized.