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The astronomical unit is typically used for stellar system scale distances, such as the size of a protostellar disk or the heliocentric distance of an asteroid, whereas other units are used for other distances in astronomy. The astronomical unit is too small to be convenient for interstellar distances, where the parsec and light-year are
The first astronomical texts that were translated into Arabic were of Indian [2] and Persian origin. [3] The most notable was Zij al-Sindhind, a zij produced by Muḥammad ibn Ibrāhīm al-Fazārī and Yaʿqūb ibn Ṭāriq, who translated an 8th-century Indian astronomical work after 770, with the assistance of Indian astronomers who were at the court of caliph Al-Mansur.
Thus, the Sun occupies 0.00001% (1 part in 10 7) of the volume of a sphere with a radius the size of Earth's orbit, whereas Earth's volume is roughly 1 millionth (10 −6) that of the Sun. Jupiter, the largest planet, is 5.2 AU from the Sun and has a radius of 71,000 km (0.00047 AU; 44,000 mi), whereas the most distant planet, Neptune, is 30 AU ...
Kinich Ahau (Mayan: [kʼiː.nitʃ a'haw]) is the 16th-century Yucatec name of the Maya sun god, designated as God G when referring to the codices. In the Classic period, God G is depicted as a middle-aged man with an aquiline nose, large square eyes, cross-eyed, and a filed incisor in the upper row of teeth.
In December 2012, NASA announced that in late August 2012, Voyager 1, at about 122 au (1.83 × 10 10 km; 1.13 × 10 10 mi) from the Sun, entered a new region they called the "magnetic highway", an area still under the influence of the Sun but with some dramatic differences.
The term Levant appears in English in 1497, and originally meant 'the East' or 'Mediterranean lands east of Italy'. [23] It is borrowed from the French levant 'rising', referring to the rising of the sun in the east, [23] or the point where the sun rises. [24] The phrase is ultimately from the Latin word levare, meaning 'lift, raise
Illustration of different stars' internal structure based on mass. The Sun in the middle has an inner radiating zone and an outer convective zone. The radiative zone is the thickest layer of the Sun, at 0.45 solar radii. From the core out to about 0.7 solar radii, thermal radiation is the primary means of energy transfer. [74]
The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by the combined effects of Earth's axial tilt and its orbital eccentricity. [ 1 ] One can photograph an analemma by keeping a camera at a fixed location and orientation and taking multiple exposures throughout the year, always at the same ...