It is tidally locked with the Sun in a 3:2 spin–orbit resonance, meaning that relative to the fixed stars, it rotates on its axis exactly three times for every two revolutions it makes around the Sun. As seen from the Sun, in a frame of reference that rotates with the orbital motion, it appears to rotate only once every two Mercurian years. Jun 19, 2019 · Merriam-Webster simply defines the firmament as “the vault or arch of the sky; heavens.”. According to Easton’s Bible Dictionary, from the Vulgate firmamentum, which is used as the translation of the Hebrew raki'a, or raqia. This word means simply "expansion." It denotes the space or expanse like an arch appearing immediately above us. You searched English word "Spin" meaning in Hindi that is "कातना". Spin translation from English into Roman Urdu is kātnā. Spin is a Verb (used With Object), Spun Or (Archaic) Span, Spun, Spinning.. We Spell Spin as [spin]. Spin meaning in Hindi has been searched.