The concepts involved in atomic physics include atomic structure, atoms in external fields, atom interactions with light and atomic collisions. Astrophysics is a division of physics that focuses on the relationship between physics and space and the study of stars, planets and galaxies. The research of this branch of physics is conducted at the Denys Wilkinson building. In the 1700s, an astronomer known as Thomas Hornsby conducted studies at Oxford and became the Savilian Professor of Astronomy in 1763. During 1793, Thomas Hornsby funded the construction for the first observatory building at Oxford. Theoretical Physics is associated with the theory behind the subject as well as the application of mathematical models, which are used to describe and predict various hypotheses. This sub-type of physics goes hand in hand with the contrasting experimental physics. Both of these sub-types are being studied in the Beecroft Building. Particle Physics primarily focuses on the interactions and properties of subatomic particles. This type of physics is closely related to atomic physics as it shares the same concept of atom analysis. Along with astrophysics, this sub-genre has also been under research in the Denys Wilkinson building at Oxford. Atmospheric Physics is the study of the Earth’s atmosphere in relation to the weather. This branch of physics particularly focuses on the middle and upper atmospheric layers and its distinguishing features. This sub-type of physics is correlated to other studies such as meteorology and climatology. The study of this division at Oxford commenced in 1920, as a meteorology lecturer named G.M.B. Dobson became apart of the Clarendon laboratory. Scientists that have conducted research at Oxford have made contributions to science including developments in technology and applications in the medical fields. An astronomer named Edmund Halley was a young astronomer who made discoveries in relation to the stars. The young astronomer sailed to an island named St. Helena to make observations of stars and broaden his star catalogue. Edmund became the first person to make telescopic observations of the stars in the southern hemisphere and had discovered a star cluster in the constellation of Centaurus during the 1690s. Halley further developed his research by creating the first maps of the geomagnetic field and the prevailing winds, which is also known as the first meteorological chart. In collaboration with Robert Hooke, both scientists tried to solve the problem of planetary orbits and discussed theories with Isaac Newton. In 1704, Edmund Halley became the Savilian Professor of Geometry at Oxford university which then lead to him publishing ‘A Synopsis of the Astronomy of Comets’, which explains his theory of multiple comets being identical.