0_Wizard
I love watching the sunset from the beach it is beautiful, The Sun will set exactly due west at the equator on the spring.
The Sun will set exactly due west at the equator on the spring and fall equinoxes, each of which occurs only once a year.
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Sunset
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Sunset
Sunset or sundown is the daily disappearance of the Sun below the horizon as a result of Earth's rotation. The Sun will set exactly due west at the equator on the spring and fall equinoxes, each of which occurs only once a year. The time of sunset is defined in astronomy as the moment when the trailing edge of the Sun's disk disappears below the horizon. Near to the horizon, atmospheric refraction causes the ray path of light from the Sun to be distorted to such an extent that geometrically the Sun's disk is already about one diameter below the horizon when a sunset is observed. Sunset is distinct from twilight, which has three phases, the first being "civil" twilight, which begins once the Sun has disappeared below the horizon, and continues until it descends to 6 degrees below the horizon; the second phase is "nautical" twilight, between 6 and 12 degrees below the horizon; and the third is "astronomical" twilight, which is the period when the Sun is between 12 and 18 degrees below the horizon.
Sundial
A sundial is a device that tells the time of day when there is sunlight by the apparent position of the Sun in the sky. In the narrowest sense of the word, it consists of a flat plate (the "dial") and a "gnomon", which casts a shadow onto the dial. As the Sun appears to move across the sky, the shadow aligns with different "hour-lines", which are marked on the dial to indicate the time of day. The "style" is the time-telling edge of the gnomon, though a single point or "nodus" may be used. The gnomon casts a broad shadow; the shadow of the style shows the time. The gnomon may be a rod, wire, or elaborately decorated metal casting.
List of Warriors characters
The "Warriors" novel series is written by Erin Hunter. Due to the large number of characters present in the novel series, this list is divided by Clan, e.g., all characters in ThunderClan are listed together. Each cat has a prefix. Eg: Dawn, Violet etc. As a young kit they will have -kit at the end of their name. Eg: Dawnkit Violetkit. When they are an apprentice -paw will be at the end of their name. Eg: Dawnpaw Violetpaw. When that cat is a warrior or medicine cat they will have a suffix. Eg: -fur -pelt -cloud -flame -wing -song etc. Eg: Dawnsong Violetflame. That is if they are in one of the clans like ThunderClan, RiverClan, WindClan, ShadowClan, Skyclan.
Analemma
In astronomy, an analemma (; from Greek "analēmma" "support") is a diagram showing the variation of the position of the Sun in the sky over the course of a year, as viewed at a fixed time of day and from a fixed location on the Earth. The north–south component of the analemma is due to change of the Sun's declination caused by the tilt of the Earth's axis, and the east–west component is due to nonuniform rate of change of the Sun's right ascension, governed by combined effects of axial tilt and Earth's orbital eccentricity. The diagram has the form of a slender figure eight, and can often be found on globes of the Earth.
Equinox
An equinox is commonly regarded as the moment when the plane of Earth's equator passes through the center of the Sun's disk, which occurs twice each year, around 20 March and 23 September. In other words, it is the point in which the center of the visible sun is directly over the equator. This simplified, but incorrect, understanding of Earth's orbital motion can lead to errors of up to 69 seconds from the actual time of equinox. The instants of the equinoxes are currently defined to occur when the ecliptic longitude of the Sun is either 0° or 180°. As the true motion of the Earth is affected by the gravitational pull of the Sun and Moon (and to lesser extent the other planets), there are tiny (up to 1¼ arcsecond) variations of the Sun's ecliptic latitude (discussed in section below) that may mean the Sun's center is not precisely over the equator at the moment of equinox.
Celestial equator
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth. This plane of reference bases the equatorial coordinate system. In other words, the celestial equator is an abstract projection of the terrestrial equator into outer space. As a result of the planet's axial tilt, the celestial equator is currently inclined by about 23.44° with respect to the ecliptic plane. An observer standing on Earth's equator visualizes the celestial equator as a semicircle passing through the zenith, the point directly overhead. As the observer moves north (or south), the celestial equator tilts towards the opposite horizon.
Daytime
On Earth, daytime is roughly the period on any given point of the planet's surface during which it experiences natural illumination from indirect or (especially) direct sunlight. Other planets and natural satellites that rotate in relation to a luminous primary, such as a local star, also experience daytime of a 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.
1_Apprentice
Sunsets are beautiful! I live in Florida, so we get to see some pretty nice sunsets out here. Which do you prefer, sunset or sunrise?
0_Wizard
sunset of course although sunrise are very beutiful as well, Near to the horizon, atmospheric refraction causes the ray path of light from the Sun to be distorted.
Near to the horizon, atmospheric refraction causes the ray path of light from the Sun to be distorted to such an extent that geometrically the Sun's disk is already about one diameter below the horizon when a sunset is observed.
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Sunset
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Atmospheric refraction
Atmospheric refraction is the deviation of light or other electromagnetic wave from a straight line as it passes through the atmosphere due to the variation in air density as a function of height. This refraction is due to the velocity of light through air, decreasing (the refractive index increases) with increased density. Atmospheric refraction near the ground produces mirages and can make distant objects appear to shimmer or ripple, elevated or lowered, stretched or shortened, with no mirage involved. The term also applies to the refraction of sound. Atmospheric refraction is considered in measuring the position of both astronomical and terrestrial objects.
Sunset
Sunset or sundown is the daily disappearance of the Sun below the horizon as a result of Earth's rotation. The Sun will set exactly due west at the equator on the spring and fall equinoxes, each of which occurs only once a year. The time of sunset is defined in astronomy as the moment when the trailing edge of the Sun's disk disappears below the horizon. Near to the horizon, atmospheric refraction causes the ray path of light from the Sun to be distorted to such an extent that geometrically the Sun's disk is already about one diameter below the horizon when a sunset is observed. Sunset is distinct from twilight, which has three phases, the first being "civil" twilight, which begins once the Sun has disappeared below the horizon, and continues until it descends to 6 degrees below the horizon; the second phase is "nautical" twilight, between 6 and 12 degrees below the horizon; and the third is "astronomical" twilight, which is the period when the Sun is between 12 and 18 degrees below the horizon.
Air mass (astronomy)
In astronomy, air mass (or airmass) is the path length for light from a celestial source to pass through the atmosphere. As it penetrates the atmosphere, light is attenuated by scattering and absorption; the thicker atmosphere through which it passes, the greater the attenuation. Consequently, celestial bodies at the horizon appear less bright than when at the zenith. The attenuation, known as atmospheric extinction, is described quantitatively by the Beer–Lambert–Bouguer law. “Air mass” normally indicates "relative air mass", the path length relative to that at the zenith at sea level so, by definition, the sea-level air mass at the zenith is 1.
Atmospheric optics
Atmospheric optics deals with how the unique optical properties of Earth's atmosphere cause a wide range of spectacular optical phenomena. The blue color of the sky is a direct result of Rayleigh scattering, which redirects higher frequency (blue) sunlight back into the field of view of the observer. Because blue light is scattered more easily than red light, the Sun takes on a reddish hue when it is observed through a thick atmosphere, as during a sunrise or sunset. Additional particulate matter in the sky can scatter different colors at different angles, creating colorful, glowing skies at dusk and dawn.
Sunrise
Sunrise or sun up is the instant at which the upper edge of the Sun appears over the horizon in the morning. The term can also refer to the entire process of the Sun crossing the horizon and its accompanying atmospheric effects. Although the Sun appears to "rise" from the horizon, it is actually the "Earth's" motion that causes the Sun to appear. The illusion of a moving Sun results from Earth observers being in a rotating reference frame; this apparent motion is so convincing that most cultures had mythologies and religions built around the geocentric model, which prevailed until astronomer Nicolaus Copernicus first formulated the heliocentric model in the 16th century.
Optics
Optics is the branch of physics which involves the behaviour and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Optics usually describes the behaviour of visible, ultraviolet, and infrared light. Because light is an electromagnetic wave, other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties. Most optical phenomena can be accounted for using the classical electromagnetic description of light. Complete electromagnetic descriptions of light are, however, often difficult to apply in practice.
Mirage of astronomical objects
A mirage of an astronomical object is a naturally occurring optical phenomenon, in which light rays are bent to produce distorted or multiple images of an astronomical object. The mirages might be observed for such astronomical objects as the Sun, the Moon, the planets, bright stars and very bright comets. The most commonly observed are sunset and sunrise mirages. Mirages are distinguished from other refraction phenomena. One of the most prominent features of mirages is that a mirage might only produce images vertically, not sideways, while a simple refraction might distort and bend the images in any way.
1_Apprentice
Is that why the sun looks much bigger as it gets closer to the horizon? Any idea why the sun changes into crazy colors right before it sets?