Sunset, also called sundown in some American English dialects, is the time at which the Sun disappears below the horizon in the west.
Sunset is the daily disappearance of the sun below the horizon as a result of the Earth's rotation.
Sunset is the time at which the trailing limb of the first sets below the .
Sunset -- For technical definition, please follow this link to the U.S. Naval Observatory Astronomical Applications website.
Alien Sunset
In one planetary system called Epsilon Andromedae, Spitzer found distinct temperature variations that correlated to the period of the planet's orbit.
Sunrise/Sunset
The times at which the apparent upper limb of the Sun is on the astronomical horizon; i.e.
Sunset over Twin Peaks
This image was taken by the Imager for Mars Pathfinder (IMP) about one minute after sunset on Mars on Sol 21.
SUNSET ON SATURN'S RINGS
Saturn's rings seen just after the Sun has set below the ring plane.
EDGE-ON VIEW OF SATURN'S RINGS ...
Sunset walk in Walpa Gorge of Kata Tjuta (296 KB + 384 KB, respectively)
Monument Valley (212 KB)
North of Pismo Beach, CA (168 KB) ...
At sunset a planet at eastern quadrature will appear near your meridian. It might be best to say that the planet at quadrature will be equal distance between the east and west horizons at sunset.
See sunsets, rainbows, the Moon and planets, and other sky phenomena in Sunlight.
Go from Day Into Night, with 83 linked illustrations.
The Aurora has an explanation and images.
Title: Sunset on the Southern Oregon Coast
Submitted by: Richard Glenn
Early Fall sunset on the Southern Oregon Coast at Meyers Creek, Jupiter shining brightly over the sea stacks. The Milky Way can be seen on the left side of the image.
Between sunset and sunrise on a clear night we can see some 3000 points of light. Include the view from the opposite side of Earth, and nearly 6000 stars are visible to the unaided eye.
Rises at sunset, transits meridian at midnight, sets at sunrise
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Waning Gibbous ...
sunrise, sunset: the first (last) appearance of the Sun above the horizon each day. This occurs when the sun's altitude reaches -0º 50'. Note that astronomers define the rising of an object as an altitude of 0º.
Sunrise & Sunset Calendar
Another way of keeping track of the seasons is to watch the sunrise and sunset points on the horizon. The Sun rises and sets at its southernmost point for the year on the day of the Southern solstice.
Sunrise, Sunset
Who hasn't enjoyed watching a sunset as the Sun's red disk sinks below the horizon. Why does the Sun now appear red?
Sunrise, Sunset: Apparent Motion of the Sun
Objectives:
Identify the Sun as the source of Earth's light.
Observe and describe changes in the Sun's altitude and position.
Recognize that day and night are determined by our view of the Sun.
(265) Mars Sunset
(288) Are Summer Nights Darker?
(291a) Angle between ecliptic and Milky Way ...
period between sunset and total darkness or between total darkness and sunrise.
about 1-2 gauss over most of its surface; as high as 10-1000 gauss in active regions. If the total angular momentum of the solar system were concentrated in the Sun, its equatorial rotation speed would be about 100 km s-1. [H76]
Sunrise/Sunset ...
What a beautiful sunset. Crystal clear. Was that a green flash? I think you were imagining it. What perfect dark skies. Absolutely beautiful. Is that the zodiacal light? I think it is! May I borrow your binoculars?
Studio 60 on the Sunset Strip
Studio 60 on the Sunset Strip is an American dramedy television television program created and written by Aaron Sorkin.
During sunrise and sunset, sunlight is attenuated due to Rayleigh scattering and Mie scattering from a particularly long passage through Earth's atmosphere and the direct Sun is sometimes faint enough to be viewed comfortably with the naked eye or ...
1 minute of arc at hourly intervals; time of sunrise, sunset, moonrise, moonset; and other astronomical information useful to navigators.
Usually produced shortly after sunset, when the sky is already dark but sunlight still reaches the high altitude where the release occurs. The barium atoms are released as a vapor, they spread rapidly and are readily ionized by sunlight.
Before sunset, he measured the longitudinal arc separating the Moon from the Sun. Then, after sunset, he measured the arc from the Moon to the star.
It was their custom to designate as the beginning of each month the day after the new moon, when the lunar crescent first appears after sunset.
(Do we mean a 24 hour period or do we mean the time between sunrise and sunset?) We usually do not have to define it with great quantitative precision to make use of it.
At the beginning of July and 40 minutes after sunset Mercury will be about 6° above the horizon; this will increase to 14° late in the month, still 40 minutes after sunset.
As the moon wanes (becoming a half moon and a crescent moon, on the way to a new moon), the moon rises during the night, after sunset, rising later each night. It then sets in the daytime, after the sun rises.
Sometimes, at sunrise or sunset, there are flashes of green light visible near the sun. This effect only happens when there are no clouds nearb the sun.
NIGHT, that part of the natural day of twenty-four hours during which the sun is below the horizon, the dark part of the day from sunset to sunrise (see DAY). The word in O. Eng.
At this point, the Moon will be nearly due south at sunset, and will set at midnight standard time. The best predawn viewing is when the Moon is in the third quarter stage. At this time, the Moon rises at midnight, and is due south at dawn.
This dust originates from comets and from asteroid collisions, and can sometimes be seen with the naked eye as a triangular glow above the horizon just before sunrise or after sunset.
The annular eclipse of 4 January 1992 seen at sunset from San Diego, California. © Dennis Mammana, 2003.
The exact time of sunrise and sunset (and similar data for moonrise and moonset) may be calculated for any date and 22,000 named cities in the United States, or by specifying the latitude and longitude of any location worldwide, using this program.
If you were located at the location labeled 6 PM, the Moon would be high in the sky, and the Sun would be on the horizon; in this case, this is also referred to as the time of sunset.
I got to Fred's "Dark Sky Reserve" just past sunset - Fred just managed to get back from work as well. We hauled scopes to the side of a hill used a year ago. Fred's 8 inch SCT was a snap to get there.
First, Mercury is never more than 2745' of angle away from the Sun and is thus seen as a "morning" star just before sunrise or an "evening" star just after sunset.
A visitor to the planet would also witness some of the most peculiar sunsets in the solar system.
Sometimes Mercury's rapid motion round the sun outpaces it's genteel rotation.
Atmospheric refraction is variable to such an extent that sunrise and sunset times cannot be predicted with any better precision than to the nearest minute.
Image above: Cirrus at Sunset, by Graeme Stephens. Credit: Chris Chrissotimos
He used Latin words to name clouds. He used words such as "cumulus" and "cirrus." Cumulus means "pile." Cumulus clouds look like piles of cotton balls.
When the Sun is close to the horizon, such as at Sunrise and Sunset, the light must pass through a much longer path in the atmosphere; more of the blue light is scattered out of this direction, leaving only the red light.
They just swing from the east of the Sun to the west and back, and we can only see them just before sunrise or just after sunset. During the period that we can see them before sunrise, we call them the "morning stars." It lasts for many days.
The line of sunrise or sunset on a planet or its satellite. At dawn and dusk when the sun is lowest in the sky (low sun), topographic features cast their longest shadows.
A planet seen in western sky after sunset, especially Venus
halo
(1) A luminous ring seen around the Moon or Sun, caused by the refraction of light through high clouds. (2) A ring of old stars which surround the Milky Way in halo fashion ...
The ideal situation would be to find a park or conservation area that is gated and is shut down at sunset. If you can find such a place, contact the park authorities and ask for special permission to access the site after hours.
Cards are convenient at the telescope, easy to stuff in the pocket of your shirt or coat, and easy of light on the sunrise or sunset limb of Mars.
Two planets and a star team up with the crescent Moon in the western evening sky shortly after sunset over the next few nights. They are low in the sky as darkness falls, so you need a clear horizon to see them.
Twilight The period of decreasing sky brightness after sunset, or of increasing sky brightness before sunrise. There are three definitions of twilight: Civil Twilight, Nautical Twilight, and Astronomical Twilight.
evening star: Any planet visible in the sky just after sunset.
event horizon: The boundary of the region of a black hole from which no radiation may escape. No event that occurs within the event horizon is visible to a distant observer.
twilight: the time after sunset or before sunrise when the sky is not fully dark.
full moon
The phase of the Moon in which it is fully illuminated and rises at sunset and sets at sunrise.
fusion crust
The melted exterior of a meteorite caused by the intense heat of entering the Earth's atmosphere.
Naval Observatory (USNO) and (since the closure of the Royal Greenwich Observatory) the UK Nautical Almanac Office, which contains information on the positions of the Sun, Moon, and planets and their satellites, phases of the Moon, eclipses, sunset ...
Kepler-16b, shown in this artist's conception, enjoys double sunsets as it circles a pair of stars. Image: David A. Aguilar (CfA) ...
Zodiacal light- a faint cone of light rising from the horizon after sunset or before sunrise; it is caused by sunlight reflected from thinly spread interplanetary material lying in the main plane of the Solar System ...
If you have dark skies and you can see the western horizon, then get ready to see Comet Ikeya-Zhang just after sunset on April 4th. Although it will be visible to the naked eye, you will get a better look if you use binoculars. ...
Since comets are brightest when near the Sun, they are usually visible only at sunrise or sunset. Charts showing the positions in the sky of some comets can be created with a planetarium program.
More about comets ...
Like Mercury, Venus is close to the Sun and so we can only see it before sunrise or after sunset. However, it can appear further above the horizon than Mercury.
 See also: Earth, Sun, Light, Time, Sky
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