Thierry Legault Thierry Legault Thierry Legault (born 1962, chinese name :特厄力‧立夠) is a French amateur astronomer, specializing in astrophotography. An engineer by trade, he started astrophotography in 1993 and resorted to CCD cameras to photograph the deep sky. He then joined the "Association des utilisateurs de détecteurs electroniques (l'AUDE)", which aims to develop astronomical observation based on electronic detectors. In 1994, along with Christian Buil, he participated in a mission at the Pic du Midi Observatory on the collision of comet Shoemaker-Levy 9 with Jupiter and launched himself into planetary photography. He is the first amateur to have shown on his photographs
Astronomical symbols Ω (capital omega), which was originally a typographical substitute for the astronomical symbol. The symbols for aspects first appear in Byzantine codices. Of the symbols for the five Ptolemaic aspects, only the three displayed here—for conjunction, opposition, and quadrature—are used in astronomy. Symbols for a comet (☄) and a star () have been used in published astronomical observations of comets. In tables of these observations, ☄ stood for the comet being discussed and for the star of comparison relative to which measurements of the comet's position were made. Astronomical symbols Astronomical symbols are abstract pictorial symbols used to represent astronomical