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The first major Arabic work of astronomy is the Zij al-Sindh by Muhammad ibn Musa al-Khwarizmi. The work contains tables for the movements of the Sun, the Moon, and the five planets known at the time. The work is significant as it introduced Ptolemaic concepts into Islamic sciences. This work also marks the turning point in Arabic astronomy.
Print/export Download as PDF; Printable version; ... Timeline of Solar System astronomy; Timeline of discovery of Solar System planets and their moons;
1582 – Pope Gregory XIII introduces the Gregorian calendar, an enhanced solar calendar more accurate than the previous Roman Julian calendar. [72] The principal change was to space leap years differently so as to make the average calendar year 365.2425 days long, more closely approximating the 365.2422-day 'tropical' or 'solar' year that is ...
This timeline of cosmological theories and discoveries is a chronological record of the development of humanity's understanding of the cosmos over the last two-plus millennia. Modern cosmological ideas follow the development of the scientific discipline of physical cosmology .
Ptolemy I Soter (Ptolemy, son of Lagus): 304–285 BC; Ptolemy II Philadelphus: 284–247 BC; Ptolemy III Euergetes: 246–222 BC; Ptolemy IV Philopator: 221–205 BC; Ptolemy V Epiphanes: 204–181 BC; Ptolemy VI Philometor: 180–146 BC; Ptolemy VIII Euergetes II: 145–117 BC; Ptolemy IX Soter II: 116–81 BC; Ptolemy XII Neos Dionysus: 80 ...
2nd century AD — Ptolemy (in his work Optics) wrote about the properties of light including: reflection, refraction, and colour. 984 — Ibn Sahl completes a treatise On Burning Mirrors and Lenses, describing plano-convex and biconvex lenses, and parabolic and ellipsoidal mirrors. [6] [7]
The June solstice marks the official start of astronomical summer in the Northern Hemisphere with the season kicking off on June 21 at 10:57 a.m. EDT.
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...