Earth __

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Possible Answers: DAY.

Last seen on: LA Times Crossword 27 Jul 19, Saturday

Random information on the term “Earth __”:

In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer. If centered on the observer, half of the sphere would resemble a hemispherical screen over the observing location.

The celestial sphere is a practical tool for spherical astronomy, allowing astronomers to specify the apparent positions of objects in the sky if their distances are unknown or irrelevant. In the equatorial coordinate system, the celestial equator divides the celestial sphere into two halves: the northern and southern celestial hemispheres.

Because astronomical objects are at such remote distances, casual observation of the sky offers no information on their actual distances. All celestial objects seem equally far away, as if fixed onto the inside of a sphere with a large but unknown radius, which appears to rotate westward overhead; meanwhile, Earth underfoot seems to remain still. For purposes of spherical astronomy, which is concerned only with the directions to celestial objects, it makes no difference if this is actually the case or if it is Earth that is rotating while the celestial sphere is stationary.


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Earth __ on Wikipedia

Random information on the term “DAY”:

On Earth, daytime is roughly the period of the day during which any given point in the world experiences natural illumination from especially direct sunlight. Daytime occurs when the Sun appears above the local horizon, that is, anywhere on the globe’s hemisphere facing the Sun. During daytime, an observer sees indirect sunlight while in the shade, which includes cloud cover. ‘Day’ is sometimes used instead of ‘daytime’, in this case ‘day’ will mean ‘the period of light between dawn and nightfall; the interval from sunrise to sunset’, which is synonymous with daytime. However, in this context, in order to be clear “daytime” should be used distinguish it from “day” which typically refers to a 24-hour period.

Other planets and natural satellites that rotate relative to a luminous primary body, such as a local star, also experience daytime of some sort, but this article primarily discusses daytime on Earth.

Approximately half of the Earth is illuminated at any time by the Sun. The area subjected to direct illumination is almost exactly half the planet; but because of atmospheric and other effects that extend the reach of indirect illumination, the area of the planet covered by either direct or indirect illumination amounts to slightly more than half the surface.

DAY on Wikipedia