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Monte Porzio Catone is located approximately 20 kilometres southeast of Rome proper. The Astronomical Observatory of Rome (OAR) was established in 1938, inside the 19th-century Villa Mellini on the hill of Monte Mario in Rome. In the same period, a new Observatory was built in Monteporzio Catone, in order to host a large telescope.
Kings of Rome (prior to the establishment of the Roman Republic) (753 BCE – 510 BCE) List of Roman Consuls; Mesoamerican chronology; Timeline of the Mongol Empire; Seljuk Rulers (1037 CE – 1194) Timeline of ancient Greece (800 BCE – 146 BCE) Timeline of ancient Mesopotamia; Timeline of Roman history (754 BCE – 1461 CE)
Ephemeris time (ET), adopted as standard in 1952, was originally designed as an approach to a uniform time scale, to be freed from the effects of irregularity in the rotation of the Earth, "for the convenience of astronomers and other scientists", for example for use in ephemerides of the Sun (as observed from the Earth), the Moon, and the planets.
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.
Astronomical chronology, or astronomical dating, is a technical method of dating events or artifacts that are associated with astronomical phenomena.Written records of historical events that include descriptions of astronomical phenomena have done much to clarify the chronology of the Ancient Near East; works of art which depict the configuration of the stars and planets and buildings which ...
The Revival of Planetary Astronomy in Carolingian and Post-Carolingian Europe. Variorum Collected Studies Series. Vol. CS 279. Ashgate. ISBN 0-86078-868-7. Hodson, F. R., ed. (1974). The Place of Astronomy in the Ancient World: A Joint Symposium of the Royal Society and the British Academy. Oxford University Press. ISBN 0-19-725944-8.
The free-fall time is the characteristic time that would take a body to collapse under its own gravitational attraction, if no other forces existed to oppose the collapse.. As such, it plays a fundamental role in setting the timescale for a wide variety of astrophysical processes—from star formation to helioseismology to supernovae—in which gravity plays a dominant ro
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