Comparison of the Different Celestial Length Measurements Approaches: Trigonometric Parallax, Cepheids and Type Ia Supernovae

Abstract

As a matter of fact, astronomical measurements are one of the important topics in astronomy especially in recent years, with significant implications for spacecraft navigation within the solar system, stellar modeling, cosmic scales as well as the evolution. On this basis, this study presents several existing measurement methods and provides detailed explanations of three commonly used methods, i.e., trigonometric parallax, cepheid, and type Ia supernovae. To be specific, the principles as well as instruments associated with these methods are detailly discussed and analyzed. According to the analysis, the typical observations as well as current state-of-art results are also presented. At the same time, the current limitations such as equipment resolution, model calibration, and differentiation of background galaxies are compared and clarified. Furthermore, the prospects for future updates and developments of new approaches are also explored in the meantime. Overall, these results shed light on guiding further exploration of length measurement for celestial.