Convert Grain (gr) to Sun's Mass (M☉) instantly.
About these units
Grain (gr)
The grain, defined as exactly 64.79891 milligrams, is one of the oldest units of mass still in limited use today. Derived from the weight of average cereal grains such as barley or wheat, it became a universal tiny unit used across Europe for coins, medicine, and gunpowder. The grain persists in firearms and ammunition manufacturing because bullet weights are still listed in grains (e.g., a "150-grain bullet"). Reloaders and ballistic engineers rely on the grain as a fine unit suitable for measuring powder charges and projectile masses. It is also used in traditional gold and silver transactions, linking it to the troy system. The grain's longevity highlights how ancient agrarian measures can remain embedded in modern technological practices.
Sun's Mass (M☉)
The Sun's mass, approximately 1.9885 × 10³⁰ kilograms, dominates the solar system, comprising 99.86% of all its mass. Solar mass controls planetary orbits, defines the structure of the heliosphere, and fuels stellar fusion reactions that sustain life on Earth. Astronomers use the solar mass as a comparative unit for other stars, star clusters, and black holes, making it one of the most important astronomical constants.