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The Nazca lines (/ ˈ n ɑː z k ə /, /-k ɑː / [1]) are a group of over 700 geoglyphs made in the soil of the Nazca Desert in southern Peru. [2] [3] They were created between 500 BC and 500 AD by people making depressions or shallow incisions in the desert floor, removing pebbles and leaving different-colored dirt exposed. [4]
Line art or line drawing is any image that consists of distinct straight lines or curved lines placed against a background (usually plain). Two-dimensional or three-dimensional objects are often represented through shade (darkness) or hue . Line art can use lines of different colors, although line art is usually monochromatic.
The maps are a large drawing of the north-west part of Middle-earth, showing mountains as if seen in three dimensions, and coasts with multiple waterlines; [T 3] a more detailed drawing of "A Part of the Shire"; [T 4] and a contour map by Christopher Tolkien of parts of Rohan, Gondor, and Mordor, very different in style. [3]
The outer edge of the dark blue line is an ellipse with the same eccentricity as that of Earth. For comparison, the light blue circle within has a diameter equal to the ellipse's minor axis . The red curve represents the Karman line 100 km (62 mi) above sea level , while the yellow band denotes the altitude range of the ISS in low Earth orbit .
The ground drawings or geoglyphs were created by humans for an as-yet-unknown reason. The intaglios are located east of the Big Maria Mountains, about 15 miles (24 km) north of downtown Blythe, just west of U.S. Highway 95 near the Colorado River. The Blythe Intaglios are the most well-known of the over 200 intaglios in the Colorado Desert. [1]
By astronomical convention, the four seasons are determined by the solstices (the two points in the Earth's orbit of the maximum tilt of the Earth's axis, toward the Sun or away from the Sun) and the equinoxes (the two points in the Earth's orbit where the Earth's tilted axis and an imaginary line drawn from the Earth to the Sun are exactly ...
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A world line of an object (generally approximated as a point in space, e.g., a particle or observer) is the sequence of spacetime events corresponding to the history of the object. A world line is a special type of curve in spacetime. Below an equivalent definition will be explained: A world line is either a time-like or a null curve in spacetime.