Night
From LoveToKnow 1911
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.
Night vision is the ability to see in a dark environment. Whether by biological or technological means, night vision is made possible by a combination of two approaches: sufficient spectral range, and sufficient intensity range.
Midnight Sun
Related Category: Astronomy: General
phenomenon in which the sun remains visible in the sky continuously for 24 hr or longer, occurring only in the polar regions.
midnight sun
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Midnight and Noon
Abstract
Just about everyone has seen parking signs, time schedules, newsletters, etc. handle the notion of 12 o'clock noon or midnight as 12AM or 12PM. Shame shame. Here are the details on why this is incorrect.
The time of day when, on average over the year, the is furthest away from its highest point in the sky. Midnight is 0:00 in . Midnight itself is neither a.m. nor p.m., but the minute between 12:00 midnight and 12:01 is a.m.
The Night Sky - An Introduction to Constellations
This is what we see when we first look at the sky
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The Night Sky
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Wishing you "Clear skies!",
Dr Jamie Love ...
On New Year's night, compare Sirius to Saturn to distinquish the Sun's seasonal paths across the sky. At 8 p.m. on New Year's Eve, Sirius reveals the Sun's place in the sky for 8 a.m. on Groundhog Day, whereas Saturn reveals its place for 8 a.m.
Sharing the Night Sky with Your Students
by Kevin Murphy ...
Why is there day and night?
Answer:
Clearly, when you see the Sun shining in the sky, it is day, and when you don't it is night. So the real question is "why is the Sun in the sky at some times and not at others?
The patterns of the stars (constellations) always stay the same, but during the course of the night they move across the sky from East to West. This is because the earth is rotating.
Three galaxies, Two star clusters, one night
The Andromeda galaxy, Bode's nebula (actually a galaxy), and the beautiful Double Cluster in Perseus.
How dark is the sky? The Moon is the main source of "natural" light pollution at night. Nightly darkness estimates are calculated using Universal Time (UT).
Northern Hemisphere (45° N, 0° W)
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1 ...
night: {night-time} the period of darkness between sunset and sunrise.
Night and Day
A group of space-minded Girl Scouts "ooh" and "ah" at the night launch of space shuttle Endeavour.
Art Contestants Lasso Their Imaginations to the Moon ...
Night-Sky Light
The faint, diffuse glow of the night sky. It comes from four main sources : airglow, diffuse Galactic light, Zodiacal light, and the light from these sources scattered by the troposphere.
NIR ...
A nighttime shot of the aurora, taken from the Netherlands, by Jan Lameer. ...
2. Night Selection
After geographic location, the major factor affecting atmospheric turbulence is the diurnal and seasonal cycle of temperature and wind.
The Night Sky by Ian Ridpath;
1994; Running Press, Pennsylvania; ISBN 1-56138-386-4
Physik der Sterne und der Sonne by Helmut Scheffler and Hans Elsässer
B.I. Wissenschaftsverlag; ISBN 3-411-01438-5 ...
Same night the mirror was tested again in partially assembled telescope. While seeing was poor, star images were focused. Out of focus images slight turned down edge but Ronchi test (on the star) indicated this to be below 0.25 inch wide.
Nightwatch by Terence Dickinson is a good introductory book on astronomy. Great section on purchasing a telescope. Star charts are so-so.
Night landing of a balloon probe dropped enroute to Halley's comet encounter
1984 Dec 21
USSR ...
Nightsiders
They are furry, have bad vision, but good ears. The look like orangutans.
Night after night the drama repeats itself: first Taurus taunts the reclining hunter, then the equal stand-off, and finally Orion takes charge, threatening the retreating animal.
A nighttime lift-off of the launch vehicle propelled Mariner 10 on its historic mission to and . Launched in November 1973, the mission lasted until March 1975 when the spacecraft was shut down and placed in orbit about the sun.
Listen to caption: ...
* NightSkyInfo.com: Constellation Antlia
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At night, the gas in a zero-pressure balloon cools and contracts, causing the balloon to sink.
The nighttime sky harbors many relics of stars that blew up long ago. Figure 21.11 is another example. It shows the Vela supernova remnant, whose expansion velocities imply that its central star exploded around 9000 B.C.
Overnight, I went from a middle class Jewish housewife, teacher and psychologist, to psychic reader, talk show hostess "The Metaphysical Experience" and "Satellite Psychic", researcher, lecturer, teacher, author, html programmer, ...
Newsnight, the news and current affairs programme still running to this day, was due to go on air on 23 January 1980, although trade union disagreements meant that its launch from Lime Grove was postponed by a week".[15] ...
Every night, a pageant of Greek mythology circles overhead. Perseus flies to the rescue of Andromeda, Orion faces the charge of the snorting bull, Boötes herds the bears around the pole, ...
At midnight on the 1st, Saturn will be between 20° and 30° above the horizon (lowest in the south and highest in the north). It will be in a direction between east and northeast.
Starry Night
Platform: Windows XP & above, Mac OS X 10.4 & above Cost: $24.95 - $239.95 Demo: N/A
Starry Night is the most visually stunning and realistic astronomy program in its class.
On the night of October 9, 1604, sky watchers looking at a rare clustering of Mars, Jupiter and Saturn, were amazed by the appearance of a "new star" as bright as the planets.
Titan's Night Side
This image of Titan's night side was taken during Cassini's very close flyby of the smoggy moon on Feb. 15, 2005.
Saturn's nightside, upper left, with the shadow cast by the planet falling across the rings.
SPOKES IN THE B RING
Distinct pattern of "spokes" in the broad, bright, middle, B Ring.
The next night, "led by what, I do not know," Galileo looked at the stars again. They were still visible, but to his amazement, they had changed position. Now all three stars were in a straight line on the west side of Jupiter.
Why is the nighttime sky dark? This a question which has bothered astronomers for centuries. We shall discuss it now. But first an historical perspective.
Scotcptic (night) vision and photoptic vision (below 0.03 (cd/m2) are subject to Purkinje effect, which causes objects to appear bluer to us in very low light conditions.
Rises at midnight, transits meridian at sunrise, sets at noon
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Waning Crescent ...
Light in the nighttime sky caused by the collision of atoms and molecules (primarily oxygen, OH, and Ne) in Earth's geocorona with charged particles and X-rays from the Sun or outer space. The airglow varies with time of night, latitude, and season.
The USA at night
The major source of light is from cities, but by looking carefully you can even see things like lights scattered in the Gulf of Mexico south of Louisiana that are from oil platforms (Ref).
On an average night we ignore that orb in the sky. We know that it is going to be there every time we look up, so we take it for granted. The average person knows that people have landed on the Moon, but do not know anything about Luna beyond that.
"We sailed on night after night, the weather growing colder and colder, and the North Star climbing towards the zenith.
A pattern in the night sky, eg the Plough (there are 88 constellations).
Cosmonaut
The Russian name for Astronaut - someone who goes into space.
Go from Day Into Night, with 83 linked illustrations.
The Aurora has an explanation and images.
See aspects of the Moon at Moon Light.
If you're out at night under a clear sky, you are likely to see a meteor. You may see dozens of meteors if you catch one of the regular meteor showers.
The line between nighttime and daytime on a moon or planet; the edge of the part of a moon or planet that is lighted by the sun.
terrestrial planets - (n.)
Mercury, Venus, Earth, and Mars.
Looking at the night sky people started doing an imaginary connect the dots with the stars and other celestial objects that appear to be stationary. These patterns of dots connected with imaginary lines are called constellations.
Pupil size: At night our pupils dilate to let the dim light in. The resulting large aperture of the lens degrades image quality and produces chromatic aberration where we can see coloured haloes around objects.
The darkness of the night sky is an important factor in optical astronomy. With the size of cities and human populated areas ever expanding, the amount of artificial light at night has also increased.
Alfvén layer (AS&T Dictionary) Term introduced in 1969 by Schield, Dessler and Freeman, to describe the region in the nightside magnetosphere where region 2 Birkeland currents apparently originate.
A faint visual phenomenon associated with geomagnetic activity, which occurs mainly in the high-latitude night sky; typical auroras are 100 to 250 km above the ground. AURORAL OVAL.
The Earth's sidereal day is four minutes shorter than the solar day our clocks are based on so a star crosses the meridian 4 minutes earlier than it did the previous night.
First of all, the spiral arms or spiral structure that you can see is due to the star formation - these things stand out like a great big zit on prom night. Actually, they are a bit bigger. The arms are bright because of large scale star formation.
It rises about 30 to 70 minutes later each day than the previous day, so the moon is out during daytime as often is it's out at night.
Surface temperatures depend on latitude and fluctuate over a wide range from day to night. At the Viking 1 lander site, the temperature regularly varied from a low near 189 K, just before sunrise, to a high of 240 K in the early afternoon.
 See also: Earth, Light, Sky, Time, Sun
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