Question: What area of study does Eddington number and Arthur Eddington have in common?
Context: Sir Arthur Stanley Eddington (28 December 1882 – 22 November 1944) was an English astronomer, physicist, and mathematician of the early 20th century who did his greatest work in astrophysics.  He was also a philosopher of science and a populariser of science.  The Eddington limit, the natural limit to the luminosity of stars, or the radiation generated by accretion onto a compact object, is named in his honour. The medical genetics of Jews is the study, screening, and treatment of genetic disorders more common in particular Jewish populations than in the population as a whole.  The genetics of Ashkenazi Jews have been particularly well-studied, resulting in the discovery of many genetic disorders associated with this ethnic group.  In contrast, the medical genetics of Sephardic Jews and Mizrahi Jews are more complicated, since they are more genetically diverse and consequently no genetic disorders are more common in these groups as a whole; instead, they tend to have the genetic diseases common in their various countries of origin.  Several organizations, such as Dor Yeshorim, offer screening for Ashkenazi genetic diseases, and these screening programs have had a significant impact, in particular by reducing the number of cases of Tay–Sachs disease. Clive W. Kilmister (1924 – May 2, 2010) was a British Mathematician who specialised in the mathematical foundations of Physics, especially Quantum Mechanics and Relativity and published widely in these fields (see References).  He was one of the discoverers of the Combinatorial Hierarchy, along with A. F. Parker-Rhodes, E. W. Bastin, and J.C.Amson.  He was strongly influenced by astrophysicist Arthur Eddington and was well known for his elaboration and elucidation of Eddington's Fundamental theory. Michael A. Persinger (born June 26, 1945) is a physical neuroscientist and natural philosopher.  He has argued that all phenomena including consciousness, spiritual experiences, and “paranormal events” can be explained by universal physical mechanisms and can be verified using the scientific method.  Persinger has argued that quantitative differences in energy, rather than qualitative distinctions, are responsible for the apparent mind-body duality.  Further, he has claimed that the structure and function of the brain determines the boundaries of human perception of the Universe, and that shared quantitative values connect local phenomena with fundamental properties of the cosmos - expanding upon the work of Sir Arthur Eddington. Homeokinetics is the study of self-organizing, complex systems.  Standard physics studies systems at separate levels, such as atomic physics, nuclear physics, biophysics, social physics, and galactic physics.  Homeokinetic physics studies the up-down processes that bind these levels.  Tools such as mechanics, quantum field theory, and the laws of thermodynamics provide the key relationships.  The subject, described as the physics and thermodynamics associated with the up down movement between levels of systems, originated in the late 1970s work of American physicists Harry Soodak and Arthur Iberall.  Complex systems are universes, galaxies, social systems, people, or even those that seem as simple as gases.  The basic premise is that the entire universe consists of atomistic-like units bound in interactive ensembles to form systems, level by level in a nested hierarchy.  Homeokinetics treats all complex systems on an equal footing, animate and inanimate, providing them with a common viewpoint.  The complexity in studying how they work is reduced by the emergence of common languages in all complex systems. The Eddington mission was a European Space Agency (ESA) project that planned to search for Earth-like planets, but was cancelled in 2003.  It was named for Arthur Eddington, a noted physicist who translated Einstein's work and carried out the first test (gravitational lensing) of the general theory of relativity.  It was originally planned for operation in 2008, but was delayed.  The ESA website now records its status as cancelled. In astrophysics, the Eddington number, "N", is the number of protons in the observable universe.  The term honors the British astrophysicist Arthur Eddington, who in 1938 was the first to propose a value of "N" and to explain why this number might be important for physical cosmology and the foundations of physics. The Eddington Medal is awarded by the Royal Astronomical Society for investigations of outstanding merit in theoretical astrophysics.  It is named after Sir Arthur Eddington.  First awarded in 1953, the frequency of the prize has varied over the years, at times being every one, two or three years.  Since 2013 it has been awarded annually. The Lynn Common Historic District encompasses the town common of Lynn, Massachusetts and the surrounding buildings which face it.  Although its establishment dates to the late 17th century, the area's time of development is predominantly in the 19th century, when the common was transformed into a park.  The common is an elongated grassy area, flanked by North and South Common Streets, with a number of small cross streets breaking it into several pieces.  City Hall Square marks its eastern boundary, and Market Square its western. The Arrow of Time, or Time's Arrow, is a concept developed in 1927 by the British astronomer Arthur Eddington involving the "one-way direction" or "asymmetry" of time.  It is an unsolved general physics question.  This direction, according to Eddington, can be determined by studying the organization of atoms, molecules, and bodies, and might be drawn upon a four-dimensional relativistic map of the world (""a solid block of paper"").
Answer: astrophysics