Agnes M. Clerke examines the physical nature and chemical constitution of the sun and celestial bodies, drawing together decades of pioneering spectroscopic research. The text begins with an extensive analysis of solar physics, detailing the progress from early wonder to systematic inquiry. The author evaluates the mechanics of solar radiation and the conservation of energy, tracing how gravitational contraction maintains the sun's incendescence.
Subsequent chapters dissect the chemistry of the sun through the interpretation of Fraunhofer lines, identifying thirty-nine common terrestrial elements while addressing missing or non-apparent substances. The author investigates the physical anomalies of the solar spectrum, including pressure-shifts and complex light distributions. Special attention is given to the reversing layer, the chromosphere, and the elusive flash spectrum observed during total eclipses.
The volume explores hydrogen, helium, and coronium, detailing their spectral series and anomalous behavior under solar conditions. Photospheric structure, the dusky veil, and the complex mechanics of sun-spots are analyzed alongside the thermal properties and rotational velocities of the solar globe. The volume concludes with an examination of faculæ, prominences, the corona, and a transition into the physics of stars and nebulæ.
Throughout the study, the author balances observational data with theoretical deductions, exposing the limits of contemporary knowledge while challenging researchers to pursue empirical verification. The investigation ultimately presents the sun not as an isolated luminous body, but as a complex physical machine operating within the broader continuity of nature.
