They aren't; their entire shape is a complete circle. From our position during rainbow formation, we can only see half of the rainbow.
The answer would depend on a semicircular WHAT. Semicircular is an adjective, there is no noun to go with it.The answer would depend on a semicircular WHAT. Semicircular is an adjective, there is no noun to go with it.The answer would depend on a semicircular WHAT. Semicircular is an adjective, there is no noun to go with it.The answer would depend on a semicircular WHAT. Semicircular is an adjective, there is no noun to go with it.
Semicircular Canals
Actually it is circular but usually the sun needs to be quite low in the sky for the angle of the sunbeams hitting the raindrops to be suitable to create a rainbow visible from the ground. But, when that happens, a part of the rainbow is cut-off by the horizon and so it appears semicircular. Full circles are rare but have been seen/photographed.
semicircular canals
No. Semicircular canals are located in the vestibule of the ear and are membranous that contain receptor cells; semicircular ducts house dynamic equilibrium receptors and contain an enlarged region and a receptor region and that respond to angular motion.
A rainbow forms a semicircle because it is created by the refraction, reflection, and dispersion of sunlight through raindrops in the atmosphere. The circular shape occurs because the angle of reflection and refraction is consistent for all raindrops within a specific range, resulting in a semicircular arc of color.
The semicircular ducts are an organ of balance located in the inner ear.
semicircular canals
The inner ear contains receptors for the sense of equilibrium. These receptors are found in structures called the vestibular system, which helps us maintain balance and spatial orientation. The vestibular system provides information to the brain about head movements and position.
Apse
Semicircular, tubercular
Endolymph