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The galactic year, also known as a cosmic year, is the duration of time required for the Sun to orbit once around the center of the Milky Way Galaxy. [1] One galactic year is approximately 225 million Earth years . [ 2 ]
The inclination of the moon's orbit is shown relative to the Ecliptic Plane. The Solar System traces out a sinusoidal path in its orbit around the galactic center. Using Galactic North as the initial frame of reference, the Earth and Sun rotate counterclockwise, and the Earth revolves in a counterclockwise direction around the Sun.
The north galactic pole is situated at right ascension 12 h 49 m, declination +27.4° near β Comae Berenices, and the south galactic pole is near α Sculptoris. Because of this high inclination, depending on the time of night and year, the Milky Way arch may appear relatively low or relatively high in the sky.
Distances of the nearest stars from 20,000 years ago until 80,000 years in the future Visualisation of the orbit of the Sun (yellow dot and white curve) around the Galactic Centre (GC) in the last galactic year. The red dots correspond to the positions of the stars studied by the European Southern Observatory in a monitoring programme. [71]
The Sun, taking along the whole Solar System, orbits the galaxy's center of mass at an average speed of 230 km/s (828,000 km/h) or 143 mi/s (514,000 mph), [168] taking about 220–250 million Earth years to complete a revolution (a Galactic year), [169] having done so about 20 times since the Sun's formation.
The plane of the ecliptic lies at an angle of about 60° to the galactic plane. [c] The Sun follows a nearly circular orbit around the Galactic Center (where the supermassive black hole Sagittarius A* resides) at a distance of 26,660 light-years, [276] orbiting at roughly the same speed as that of the spiral arms. [277]
You have just a few weeks left to view the "comet of the century" making its 80,000-year orbit around Earth. ... takes more than 200 years — or 80,000 years in this case — to orbit the sun. ...
The day occurs at a regular interval of 1.7361 years (or 633.7 days), [5] which is called a galactic tick. The interval is derived from one centi - arcsecond of a galactic year , which is the Solar System's roughly 225-million-year trip around the Galactic Center . [ 6 ]