Label: Not On Label - none • Format: CDr Album • Country: Russia • Genre: Electronic, Rock • Style: Acoustic, Industrial, Doom Metal
Constellation List. There are 88 constellations officially recognized by the International Astronomical Union (IAU). 36 modern constellations predominantly lie in the northern sky, while 52 are found in the southern celestial hemisphere. Most constellations (more than 40) represent animals. Many were named after humans or figures from mythology.
Stonehenge is a famous example. Among other things, it was used to identify the first day of summer, the "summer solstice."Ancient astronomers could use it like a giant gunsight to determine when the sun was rising in a certain direction. They sighted through the monument to a large stone placed at a distance, the heelstone, to identify the day of the summer solstice.
· Anything north of the celestial equator has a northerly declination, marked with a positive sign. Anything south of the equator has a negative declination written with a negative sign. For instance, Vega's declination is +38° 47′ 1″, while Alpha Centauri's is –60° 50′ 2″. One star is north of the celestial equator and the other south.
But for astronomical observations, we need to use sidereal time (star time). Consider the rotation of the Earth relative to the stars. We define one rotation of Earth as one sidereal day, measured as the time between two successive meridian passages of the same star. Because of the Earth's orbital motion, this is a little shorter than a solar day.
· Photo credit: David Edgar. The Chankillo astronomical site in Peru is so complex that we only discovered its true function in with the help of a computer program designed to align solar panels. Stretching meters ( ft) along the hilltop, the site is made up of 13 towers arranged in a .
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