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As seen from the Earth, a solar eclipse is a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks ("occults") the Sun. This can ...
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A solstice is an astronomical event that occurs twice each year as the Sun reaches its highest or lowest excursion relative to the celestial equator on the celestial sphere. The solstices, together wi ...
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A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position. The term goniometry is derived from two Greek words, gōnia, meaning angle, ...
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In geophysics, the dynamo theory proposes a mechanism by which a celestial body such as Earth or a star generates a magnetic field. The dynamo theory describes the process through which a rotating, co ...
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Adobe (/əˈdoʊbi/, UK /əˈdoʊb/, Spanish pronunciation: [aˈðoβe]; Arabic: الطوب) is the Spanish word for mud brick, a natural building material made from sand, clay, water, and some kind of fibrous or o ...
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The horizon (or skyline) is the apparent line that separates earth from sky, the line that divides all visible directions into two categories: those that intersect the Earth's surface, and those t ...
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Sunset or sundown is the daily disappearance of the Sun below the western half of the horizon, i.e. at an azimuth greater than 180 degrees, as a result of Earth's rotation.The time of sunset is de ...
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The photosphere of an astronomical object is the depth of a star's outer shell from which light is radiated. The term itself is derived from Ancient Greek roots, f??, f?t??/phos, photos meaning &q ...
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Biomass is biological material derived from living, or recently living organisms. It most often refers to plants or plant-based materials which are specifically called lignocellulosic biomass. As an e ...
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This is a list of sources of light, including both natural and artificial sources, and processes and devices which emit light. The list is oriented towards visible light: most things emit photons thro ...
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