1913 in science

The parsec (symbol: pc) is a unit of length used to measure the large distances to astronomical objects outside the Solar System, approximately equal to or (au), i.e. . The parsec unit is obtained by the use of parallax and trigonometry, and is defined as the distance at which 1 au subtends an angle of one arcsecond ( of a degree). The nearest star, Proxima Centauri, is about from the Sun: from that distance, the gap between the Earth and the Sun spans slightly less than one arcsecond. Most stars visible to the naked eye are within a few hundred parsecs of the Sun, with the most distant a

atomic model introduced by Niels Bohr in 1913

book on the foundations of mathematics

Group dynamics

method of production of liquid hydrocarbons for use as synthetic fuel

overview of natural science-related events during the year of 1913

solar eclipse

meteor procession in the 1913s

20th-century partial solar eclipse

20th-century partial solar eclipse

expedition down the River of Doubt