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The rising Sun illuminates the inner chamber of Newgrange, Ireland, only at the winter solstice.. Archaeoastronomy (also spelled archeoastronomy) is the interdisciplinary [1] or multidisciplinary [2] study of how people in the past "have understood the phenomena in the sky, how they used these phenomena and what role the sky played in their cultures". [3]
The Obelisk of Axum (Tigrinya: ሓወልቲ ኣኽሱም, romanized: ḥawelti Akhsum; Amharic: የአክሱም ሐውልት, romanized: Ye’Åksum ḥāwelt) is a 4th-century CE, 24-metre (79 ft) tall phonolite [3] stele, weighing 160 tonnes (160 long tons; 180 short tons), in the city of Axum in Ethiopia.
Precious opal shows a variable interplay of internal colors, and though it is a mineraloid, it has an internal structure. At microscopic scales, precious opal is composed of silica spheres some 150–300 nm (5.9 × 10 −6 –1.18 × 10 −5 in) in diameter in a hexagonal or cubic close-packed lattice.
Armourstone is a generic term for broken stone with stone masses between 100 and 10,000 kilograms (220 and 22,050 lb) (very coarse aggregate) that is suitable for use in hydraulic engineering. Dimensions and characteristics for armourstone are laid down in European Standard EN13383. [ 1 ]
(20) Four thousand celestial years is the duration of the first or Krita age. The morning of that cycle consists of four hundred years and its evening is of four hundred years. (21) Regarding the other cycles, the duration of each gradually decreases by a quarter in respect of both the principal period with the minor portion and the conjoining ...
Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.
The crew works approximately 10 hours on weekdays and 5 hours on Saturdays, with the remaining time allocated for relaxation or catching up on tasks. Free time often involves enjoying personal hobbies, communicating with family, or gazing out at Earth through the station’s windows. [309]
This list of countries by life expectancy provides a comprehensive list of countries alongside their respective life expectancy figures. The data is differentiated by sex, presenting life expectancies for males, females, and a combined average.