པར་སེག གཞུ་ཁུག་སྐར་ཆ།
phys. A unit of length used to express astronomical distance. The distance at which the mean radius of the earth’s orbit subtends an angle of one second of arc. One […]
phys. A unit of length used to express astronomical distance. The distance at which the mean radius of the earth’s orbit subtends an angle of one second of arc. One […]