Home (Sunrise)

 Astronomy 

  » »
 
   

Sunrise

Astronomy  Sunflower Galaxy  Sunset

Sunrise is the instant at which the upper edge of the Sun appears above the horizon in the east. Sunrise should not be confused with dawn, which is the (variously defined) point at which the sky begins to lighten, some time before the sun itself appears, ending twilight.


Sunrise on the Bay of Rainbows
By Brian Ventrudo
A day or two after the Moon reaches first quarter, sunlight spreads over a striking region on the Moon known as Sinus Iridum, the 'Bay of Rainbows'.

How do sunrise and sunset times change with altitude? (Intermediate)
How does the location of sunrise and sunset change throughout the year? (Advanced)
How does the position of Moonrise and Moonset change? (Intermediate) ...

Sunrise is the time at which the leading limb of the first rises above the . The effect of refraction in the Earth's atmosphere lifts the image of the about half a degree at the horizon, making sunrise about two minutes earlier than would be expected from the actual position of the in space.

Happy autumnal equinox: here's a year of sunrises
At 09:05 UTC (05:05 Eastern US time) this morning, the position of the center of the Sun's disk, moving south, crossed the celestial equator on the sky. For normal people, this means it was the moment of the autumnal equinox.

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.

Sunrise from Flight Deck
Credit: Ben Cooper and Don Hladiuk
The sunrise as seen from the flight deck of the aircraft. [Read the Full Story Behind the Eclipse-Chasing Expedition Here] ...

Sunrise at the South Pole
Today's autumnal equinox heralds the dawn of a new day at the South Pole as Earth joins three other planets in the solar system where it is autumn in the northern hemisphere.
Just Passing By Earth ...

Sunrise -- For technical definition, please follow this link to the U.S. Naval Observatory Astronomical Applications website.
Sunset -- For technical definition, please follow this link to the U.S. Naval Observatory Astronomical Applications website.

Sunrise/Sunset
The times at which the apparent upper limb of the Sun is on the astronomical horizon; i.e.

12 : Sunrise or sunset, as seen from the surface of the Moon, appears to us here on Earth as the Moon's ...
maria.
rays.
Lunar Transient Phenomena (LTP).
terminator.

Sunrise from the Space Shuttle, STS-47 mission. You might find it interesting to remember, the next time you watch a beautiful sunrise or sunset, that the sun itself actually dipped below the horizon eight minutes earlier--it takes that long for the light to reach the Earth! ...

Sunrise on Sisyphos: this planet is less than three million kilometers from its star (the world is tidally locked, so such sunrises occur only on the terminator and occur due to libration effects)
Sisyphos - Data Panel ...

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
Noon
The phase diagram seems to show that a solar and lunar eclipse should happen every month but eclipses actually happen only twice a year. You can see why if you look at the Moon's orbit from close to edge-on.

Is sunrise any faster in the tropics--or actually slower--or else, latitude really makes no difference? Explain.

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 safely with optics (provided there is no risk of ...

Rises at sunrise, transits meridian at noon, sets at sunset
A
Waxing Crescent ...

* Latest sunrise of the year.
Click here to return to the calendar page.
*William G. Swan stayed aloft for 30 minutes over Atlantic City, N.J., in a glider powered with 10 small rockets (1931) ...

Sacagawea Sunrise
Rate these videos or search for more
Search over 100 encyclopedias and dictionaries: ...

The sunset or sunrise line on the Moon or a planet.
Terrestrial
A term used to describe anything originating on the planet Earth.

8. A day, from sunrise to sunrise, on Mercury is equivalent to 176 Earth Days.
9. Mercury is the closest planet to the sun, the maximum distance from the Sun = 70 million km (43.5 million miles).
10. Mercury's minimum distance from Earth = 77 million km (48 million miles).

The time from one sunrise to the next is called a solar day. The time between successive risings of any given star is one sidereal day. Because of Earth's revolution around the Sun, the solar day is a few minutes longer than the sidereal day.

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.

The site includes a sunrise and sunset time calculator, visibility predictions for the new crescent Moon, maps of forthcoming eclipses and information on UK public holidays.

green flash (NASA SP-7, 1965) A brilliant green coloring of the upper edge of the sun as it appears at sunrise or disappears at sunset when there is a clear, distinct horizon.

Strong horizontal gradients are associated with the equatorward boundary of the auroral oval (especially in the night sector) and the sunrise terminator. nT (nanotesla ). 10E-9 tesla or 0.000000001 tesla. O ordinary mode.

But first we need to define "sunrise." The World Almanac defines it as the instant the upper limb of the Sun touches the horizon. By this definition we can't see a sunrise until the Sun has risen after having been completely below the horizon.

The Babylonians and Hindoos began their day at sunrise, the Athenians and Jews at sunset, the ancient Egyptians and Romans at midnight. -- Day blindness. Med. See Nyctalopia. -- Day by day, or Day after day, daily; every day; continually; without intermission of a day. See under By.

Why is it suddenly getting brighter in the direction opposite the sunrise?

This heliacal rising is the first time in the year when Sirius was seen in the sky just before sunrise. This rising of Sirius (known by the Egyptians as Sothis) signaled the beginning of festivals celebrating fertility and renewal.

nearly an hour before sunrise, Perseus will be due east. The Moon, nearly 40 degrees away, should present a minimal problem. Also, low towards the cast are the planets Venus and Mars huddled close together. Less than four degrees away from the Moon is the planet Saturn.

twilight Period before sunrise and after sunset when the illumination of the sky gradually increases and decreases respectively.

(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.

It started to move away just before sunrise and once Sun cleared horizon, through a narrow gap between layers of clouds, I noticed Venus immediately as a black disk against deep red, deformed face of our Star! ...

It was three hours before the Martian sunrise when it landed. The probe quickly deflated the air bags, then opened up like a flower - each "petal" being a solar panel to generate power. Four hours later, it broadcast a signal to Earth.

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.

We had stuck something in our arguments to get his attention because, had we maintained the Apollo 8 target for Apollo 10, we would have had a pre-sunrise, quasi-nighttime splashdown. And he'd been nervous about that.

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.

As it does so, it goes from being the 'Evening star', visible after sunset, to being the 'Morning star', visible before sunrise.

The interval of time preceding sunrise and following sunset (see Sunrise; unset) during which the sky is partially illuminated.

The use of 'East' to mean the 'in' direction (actually 'in' → 'East' → 'sunrise' → 'up') may appear unnecessarily contrived. Previously, as related in the first reference cited above, Faraday had used the more straightforward term "eisode" (the doorway where the charge enters).

*Venus can be viewed with the naked eye in the east up to 3 hours before sunrise, and in the west up to 3 hours before sunset.

It was taken one hour before sunrise on the rover's 63rd martian day, or "sol." The final image is a mosaic of the navigation camera showing a broad view of the sky and the panoramic camera image of Earth.

A meager partial lunar eclipse will take place before sunrise Monday, as the Moon just dips into Earth's dark shadow. The shadow will take a small "bite" out of the Moon's southern hemisphere. From most of the United States the Moon will set before the eclipse peaks.

On Mercury, which is longer, one solar day (sunrise to sunrise on Mercury) or one year (one revolution around the Sun)?
Day Year 8. Does it ever get cold on Mercury?
Yes No 9. On Mercury, would you feel lighter or heavier than on Earth?
Lighter Heavier 10.

Some are only seen near the Sun, either around the time of sunrise or sunset (Mercury and Venus are the two that do this - in the animation, the Sun is the yellow dot, Mercury is the red dot, and Venus is the bluish dot. The stars have been removed to show the motion clearly).

Naked eye map - Comet ISON location in early August - 30 minutes before sunrise, looking east-northeast.
Naked eye map - Comet ISON location in mid-August - 30 minutes before sunrise, looking east-northeast.
Naked eye map - Comet ISON location in late August - 30 minutes before sunrise, looking east.

For example, more than 400,000 people gathered for the Sunrise Event on New Year's Day in Busan City, South Korea. In Brazil, the 2009 Brazilian Olympiad of Astronomy and Astronautics saw more than 750,000 students participate from 32,500 schools.

Twilight: The time preceding sunrise and following sunset when the sky is partially illuminated. Civil twilight occurs when the central point of the Sun's disk is between 9050′ and 96, nautical twilight from 96 to 102, and astronomical twilight from 102 to 108.

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.

Early in the 20th century, the English astronomer Sir Norman Lockyer demonstrated that the northeast axis aligned with the sunrise at the summer solstice, leading other scholars to speculate that the builders were sun worshipers.

Terminator: The line between night and day, where sunrise or sunset is occurring.
Terrestrial Planets: A rocky planet with a relatively thin atmosphere. Mercury, Venus, Earth, and Mars are the four terrestrial planets in our solar system.

At many locations, surface turbulence follows a diurnal cycle from a minimum just after sunrise, steeply rising to a peak during early afternoon, declining to a secondary minimum shortly after sunset, and increasing slightly during the early evening before returning to minimum in the morning.

morning star (19) Any planet visible in the sky just before sunrise.
multicellular (321) An organism composed of more than one cell.
multiringed basin (275) Large impact feature (crater) containing two or more concentric rims formed by fracturing of the planetary crust.

For Right Ascension, astronomers always use the convention of Hours:Minutes:Seconds. There are 24 hours of RA around a circle in the sky, because it takes 24 hours for the Sun to move all the way from sunrise to the next sunrise. Right Ascension 06:45:09, Declination -16:42:58 meaning ...

Sunlight creates sunsets and sunrises that range from quiet and peaceful to colorfully spectacular. It is observed in the blue sky, in rainbows and colored rings, and in peaceful twilights. Sunlight is seen at night reflected from the Moon and planets, which leads us inexorably back to the stars.

A partial transit can be seen in progress at sunrise throughout Europe, western Asia, and eastern Africa. A partial transit can be seen in progress at sunset throughout most of North America, Central America, and western South America. The next transit will not take place until the year 2117.

Here on earth we know it's time for breakfast when the sun comes up, but what does that mean on the International Space Station where astronauts get to see a sunrise every hour and a half? We either have to find solution to this problem. or ship up a bunch of milk and cereal! ...

Solstice Literally "sun still". It refers to the apparent standstill of sunrise and sunset points at midsummer and midwinter. (i) The most southerly and northerly declinations of the Sun. (ii) The date on which the Sun attains its greatest declination.

Although Mercury is not tidally locked to the Sun, its rotational period of almost 59 days is tidally coupled to its orbital period of 88 days, rotating only one and a half times during each orbit in a 3:2 resonance. Hence, a "day" on Mercury (sunrise to sunrise) is 176 Earth days long.

The zenith skyglow at sunrise or sunset.
The Distribution of Glow Across the Sky ...

morning star: Any planet visible in the sky just before sunrise.
multiringed basin: Very large impact basins in which there are concentric rings of mountains.
mutant: Offspring born with altered DNA.

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.

Many comets are first discovered by amateur astronomers. 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 ...

twilight: the time after sunset or before sunrise when the sky is not fully dark.

A planet visible in the Morning shortly before sunrise is a morning star, a planet visible just before sunset is the Evening Star.
N
Nanometer ...

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.

The name Sirius comes from the Greek Σείριος (Seirios), which means "scorching," "glowing" or "searing." In ancient times, the star rose just before sunrise during the hottest summer period, the so-called Dog Days.

heel stone -- the large upright boulder (or menhir) at Stonehenge that is aligned with the summer solstice sunrise.
latitude -- distance on the Earth (measured in degrees) north or south of the equator.

A diffuse band of light visible along the ecliptic near sunrise and sunset, created by sunlight scattered off of interplanetary dust.

To an observer situated on the planet's hot pole at aphelion during a sunrise, the Sun would approach the zenith (getting larger as it does so), but since the orbital angular velocity is greater than the constant-spin angular velocity for a time, the Sun appears to stop, ...

Zodiacal Light
a faint cone of light that can sometimes be seen above the horizon after sunset or before sunrise. Zodiacal light is caused by sunlight reflecting off small particles of material in the plane of the Solar System.

Full Moon
The Moon when it lies directly opposite the Sun. The Moon is full two weeks after new Moon. The full Moon rises at sunset and sets at sunrise. Earth is between the full Moon and the Sun.

Hoisting the youth on his shoulders, Orion headed east towards the sunrise, which an oracle had told him would restore his sight. As the sun's healing rays fell on his sightless eyes at dawn, Orion's vision was miraculously restored.

There is truth in the joke that you could take a look at the Sun through a telescope only twice in your life - once with your left eye, and again with your right eye. The only time you could look directly at the solar disk with your naked eyes is right after sunrise or right before sunset.

Mercury and Venus are particularly easy to see when at greatest elongation. When the planet is at maximum EASTERN elongation the planet is seen in the evening close to sunset. When the planet is at maximum WESTERN elongation, the planet is seen in the morning close to sunrise (see diagram 2).

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. Eventually, the moon rises so late at night that it's actually rising around sunrise, ...

ZODIAC: The twelve constellations straddling the ecliptic through which the sun, Moon, and planets appear to move during the year.
ZODIACAL LIGHT: A faint cone of light rising from the horizon after sunset or before sunrise; ...

See also: See also: Astro, Earth, Sun, Sky, Planet

◄ Sunflower Galaxy   Sunset ►
 
RSS Mobile