Before revision: Each calendar month is separated into two parts: days 1 to 15 ( ascending ) day 16 until the end of the month ( descending ) Newly identified small Solar System bodies, such as comets and asteroids, are given systematic designations that contain the half-month encoded as a letter of the English alphabet.
After revision: Each calendar month is separated into two parts: days 1 to 15 ( starting ) day 16 until the end of the month ( finishing ) Newly identified small Solar System bodies, such as comets and asteroids, are given systematic designations that contain the half-month encoded as a letter of the English alphabet.