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The "Gate of the Sun" The Gate of the Sun, also known as the Gateway of the Sun (in older literature simply called "(great) monolithic Gateway of Ak-kapana", [1] is a monolithic gateway at the site of Tiahuanaco by the Tiwanaku culture, an Andean civilization of Bolivia that thrived around Lake Titicaca in the Andes of western South America around 500-950 AD.
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The Sun is a rotating sphere of plasma at the center of the Solar System. It lacks a solid or liquid surface, so the interface separating its interior and its exterior is usually defined as the boundary where plasma becomes opaque to visible light, the photosphere. Since plasma is gaseous in nature, this surface has no permanent demarcated ...
Solar cycles are nearly periodic 11-year changes in the Sun's activity that are based on the number of sunspots present on the Sun's surface. The first solar cycle conventionally is said to have started in 1755. The source data are the revised International Sunspot Numbers (ISN v2.0), as available at SILSO. [1]
Since the apparent movement of the Sun as viewed from Earth is nearly symmetrical about the solstice, plotting dates for one half of the year gives a good approximation for the rest of the year. Thus, to simplify the diagram, some sun charts show days for different months as the same, e.g. March 21 equals September 21.
The Sun and planets of the Solar System (distances not to scale). The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. It formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc.
Lowitz's diagram of solar halos (1790). The Sun (labeled αβa) lies within the two overlapping circles near the bottom of the image. Sun dogs (labeled bx and cy) lie to the Sun's left and right. The "Lowitz arcs" (labeled xi and yk) descend at an acute angle from the sun dogs and intersect the circles that surround the Sun.
The gates of the Sun are typically identified as the gates of the underworld. They seem to have several parallels in Homeric texts; the souls ( psychae ) enter the underworld through the gates, the same ones as the sun when it sets, while Hades himself is described as pylartes ("the gate-closer"). [ 11 ]