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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.
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
Time zones of the world. A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time.
Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Earth. [1] For example, the Astronomical Almanac uses TT for its tables of positions (ephemerides) of the Sun, Moon and planets as seen from Earth.
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.
Italy alternates between Central European Time (Italian: Tempo dell'Europa Centrale, UTC+01:00) and Central European Summer Time (Italian: Orario Estivo dell'Europa Centrale, UTC+02:00), because it follows the European Summer Time annual Daylight saving time (Italian: ora legale) procedure. As such Italy begins observing Central European Summer ...
This page was last edited on 29 January 2021, at 00:58 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Local mean time (LMT) is a form of solar time that corrects the variations of local apparent time, forming a uniform time scale at a specific longitude. This measurement of time was used for everyday use during the 19th century before time zones were introduced beginning in the late 19th century; it still has some uses in astronomy and navigation.