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Earthshine has a calculated maximum apparent magnitude of −3.69 as viewed from Earth. [3] This phenomenon is most visible from Earth at night (or astronomical twilight) a few days before or after the day of new moon, [5] when the lunar phase is a thin crescent. On these nights, the entire lunar disk is both directly and indirectly sunlit, and ...
High Definition Earth Viewing (HDEV) cameras were a payload package delivered to the International Space Station on the SpaceX CRS-3 Mission, launched on April 18, 2014. [ 1 ] [ 2 ] The High-Definition Earth Viewing camera suite was carried aboard the Dragon spacecraft and is configured on a platform on the exterior of the European Space Agency ...
DigitAlb Sh.A is an Albanian media, digital satellite and terrestrial TV platform based in Tirana, Albania. [1] [2] The TV platform began terrestrial broadcasts on 15 July 2004, and satellite broadcasts by the end of that year.
EarthTV's camera in Macau.. EarthTV Network GmbH is a German satellite Television Network, which airs live broadcasts from its camera network around the world. [1] [2] Cameras are located in well-known cities as well as lesser-known locations.
Earth's rotational velocity also varies in a phenomenon known as length-of-day variation. [171] Earth's annual orbit is elliptical rather than circular, and its closest approach to the Sun is called perihelion. In modern times, Earth's perihelion occurs around 3 January, and its aphelion around 4 July.
English: This image of Earth’s city lights was created with data from the Defense Meteorological Satellite Program (DMSP) Operational Linescan System (OLS). Originally designed to view clouds by moonlight, the OLS is also used to map the locations of permanent lights on the Earth’s surface.
The study of light, known as optics, is an important research area in modern physics. The main source of natural light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps.
Obliquity of the ecliptic is the term used by astronomers for the inclination of Earth's equator with respect to the ecliptic, or of Earth's rotation axis to a perpendicular to the ecliptic. It is about 23.4° and is currently decreasing 0.013 degrees (47 arcseconds) per hundred years because of planetary perturbations.