what is the name of eath's orbit at which the hours daylight and darkness?
108762
There is a common misconception that winter happens when earth is farthest from the sun.  Actually, earth's orbit is only slightly elliptical.  Temperatures vary because of the inclination of the earth.\n\nThe hours of daylight and darkness are not related to earth's orbit.  The hours change because the earth rotates about the north pole - south pole axis and this axis is tilted relative to the sun.  Check the link in sources for all the details!
110633
Geosynchronous orbit - 22,800 miles altitude over the equator\n\n New Launch: 15 February 2006 2335 GMT  \nSite:Pacific Ocean (206 degrees East - 154 West)  \nLauncher:SL-16 3SL  \nInternational Number(s): 2006-003A  \n  \nSSC Name Owner \n28935  ECHOSTAR-10  USA  \n\nThis is a high-power Ku-band satellite with a life span of 15 years. It will be placed at 250 degrees East.
253656
Obviously  it appears to rise in the east and set in the west. A little trick to try from anywhere in the world....\nPick a spot you can stand at the same time as often as you can , the same time everyday.  Pick a landmark and make a note where the sun seems to rise in relation to this landmark.  You will be able to track the travel as the sun moves north to south and back again as it rises in the morning.  Email me for more info on this
86908
The Gnomon;\nPicture at this link.\nhttp://www.rnzih.org.nz/pages/sundial2.htm
787984
Not as long as the earth's axis remains tilted at 23° 27’ (lets call this 24°) with respect to its orbit plane around the sun. \n\nThat is why any part of the earth north of  66° lattitude (= 90°- 24°), the Arctic Circle,  is exposed to the sun all 24 hours in the summer when the earth is leaning toward the sun. This is called the "midnight sun".\n\nHope this helps!
100157
March 29th, 2006\n\nhttp://sunearth.gsfc.nasa.gov/eclipse/SEmono/TSE2006/TSE2006.html
731930
If you have a compass measure the angle between the position of the sun and south.  Divide this by 15 (from 180 deg divided by 12hrs) to get hours before/after midday.  If the measured angle is greater than 180 (e.g. after midday) then add your hours to 12, if the angle is lower than 180 (i.e. before midday) then subtract you angle from 12 to get the time. this time will be in GMT (or universal time) so if you are somewhere that is using +1hrs (eg BST) then add that on afterwards. Alternatively without a compass you can eyeball it have guess where the sun is relative to the south.   Sunrise and sunset positions change throughout the year and are still related to time. \nAt night time you have to know the stars and the correct rising and setting times for the particular time of the year.  They all revolve around the north star.  One way to do it is to pick a constellation that you know - like Orion - the website link at the end say that in the UK this is at it's highest point in the sky at about midnight at this time of year, and it travels from east to west, so you can estimate the time based on it's height.\n\nIf it's cloudy you're stuffed.
177491
Nightfall is the period between afternoon and nighttime. It has many synonyms:\n\ndusk, eve, evening, eventide, gloaming, twilight, even (arch), vesper (from the evening star, Venus which was called Vesper), evenfall, fall, crepuscule, etc. \n\nActually, the sun is already lower than the horizon when we see the last rays of the sun, because of the refraction of the light by the atmosphere. So the day actually appears longer because of this refraction phenomenon.
115449
Sun synchronous orbit - a low earth orbit with a period of two hours.  If at the correct inclination, the satellite will be over the same point on earth at the same time each day.\n\nGeosynchronous orbit - a high orbit with a period of twenty four hours.  At this altitude, the satellite appears to be fixed over the same spot on the equator.\n\nMolnaya orbit - a highly eliptical orbit with a period of twelve hours.  Because the satellite accellerates as it approaches earth and decellerates as it moves away from earth, a satellite in a Molnaya orbit is visibile to polar regions during much of its orbit.  A constellation of three satellites in Molnaya orbit can provide continous visibility to polar regions.
246703
It is the spring equinox, the first day of spring.  It is when the earth in it's orbit around the sun is at a position where the daylight hours are equivalent to the darkness hours when the earth rotates.  This year it's on March 20th.
1003422
12:25 AM eastern daylight time july 3rd....Stay up late sunday night! With a little luck you may see it but they say unless you have a good telescope it probably wont be viewable....I have mine ready so if I get lucky we will send a pic!
661135
The sun will be directly overhead at 12 noon.  The horizontal path the sun follows traced by its position at sunrise on different days along the horizon, well it'll be in the middle (kinda hard to see this one unless you're tracking the sun somehow, like in the movie Cast Away).  The amount of sunlight will be exactly 12 hours on the equator and will be a function of latitude for anywhere else (such as 12*cos(latitude) for anywhere else in the world).  Other than that, I can't think of anything.  Nothing grandiose happens...
978319
The orbit is called geosynchronous.  Check out the NASA website.  Your can see all the satellites we human have put into orbit.  It'll shock you!
683351
Active at twilight - Crepuscular\nActive at evening/night - nocturnal\nActive at morning - diurnal\nActive at dawn - auroral
53143
The moon rotates on its own axis and orbitrs the planet Earth as Earth orbits the sun.\n\n\nFrom Wikipedia and verified though other sources:\nThe Moon is Earth's only natural satellite. It has no formal name other than "The Moon", although in English it is occasionally called Luna (Latin for moon), or Selene, to distinguish it from the generic "moon" (natural satellites of other planets are also called moons). Its symbol is a crescent. The terms lunar, selene/seleno-, and cynthion (from the Lunar deities Selene and Cynthia) refer to the Moon (aposelene, selenocentric, pericynthion, etc.).\n\nThe average distance from the Moon to the Earth is 384,403 kilometers (238,857 miles). The Moon's diameter is 3,476 kilometers (2,160 miles).\nThe Moon makes a complete orbit about the Earth approximately once every 28 days. Each hour the Moon moves relative to the stars by an amount roughly equal to its angular diameter, or by about 0.5°. The Moon differs from most satellites of other planets in that its orbit is close to the plane of the ecliptic and not in the Earth's equatorial plane.\n\nSeveral ways to consider a complete orbit are detailed in the table below, but the two most familiar are: the sidereal month being the time it takes to make a complete orbit with respect to the stars, about 27.3 days; and the synodic month being the time it takes to reach the same phase, about 29.5 days. These differ because in the meantime the Earth and Moon have both orbited some distance around the Sun.\n\nThe gravitational attraction that the Moon exerts on Earth is the cause of tides in the sea. The tidal flow period, but not the phase, is synchronized to the Moon's orbit around Earth. The tidal bulges on Earth, caused by the Moon's gravity, are carried ahead of the apparent position of the Moon by the Earth's rotation, in part because of the friction of the water as it slides over the ocean bottom and into or out of bays and estuaries. As a result, some of the Earth's rotational momentum is gradually being transferred to the Moon's orbital momentum, resulting in the Moon slowly receding from Earth at the rate of approximately 38 mm per year. At the same time the Earth's rotation is gradually slowing, the Earth's day thus lengthens by about 15 µs every year. A more detailed discussion follows in the section titled Earth & Moon.\n\nThe Moon is in synchronous rotation, meaning that it keeps the same face turned to the Earth at all times. This synchronous rotation is only true on average because the Moon's orbit has definite eccentricity. When the Moon is at its perigee, its rotation is slower than its orbital motion, and this allows us to see up to an extra eight degrees of longitude of its East (right) side. Conversely, when the Moon reaches its apogee, its rotation is faster than its orbital motion and reveals another eight degrees of longitude of its West (left) side. This is called longitudinal libration.\n\nBecause the lunar orbit is also inclined to the Earth's equator, the Moon seems to oscillate up and down (as a person's head does when nodding) as it moves in celestial latitude (declination). This is called latitudinal libration and reveals the Moon's polar zones over about seven degrees of latitude. Finally, because the Moon is only at about 60 Earth radii distance, an observer at the equator who observes the Moon throughout the night moves by an Earth diameter sideways. This is diurnal libration and reveals about one degree's worth of lunar longitude.\n\nEarth and Moon orbit about their barycenter, or common center of mass, which lies about 4700 km from Earth's center (about 3/4 of the way to the surface). Since the barycenter is located below the Earth's surface, Earth's motion is more commonly described as a "wobble". When viewed from Earth's North pole, Earth and Moon rotate counter-clockwise about their axes; the Moon orbits Ea
445003
The date or time is unknown, but as per the scientists, it is expected to occur, it's called as retrograde motion. A detailed report could be extracted from the website mentioned below, http://www.space.com/spacewatch/mars_retrograde_030725.html\n\nSurprisingly, this phenominon is announced around 1400 years back by Muslims in their Holy Quran & Authentic Narration from Prophet Muhammad peace be upon him.\n\nSome references from the Holy Quran: \n1) Chapter 02:Verse258:- "Abraham said, Verily!Allah causes the sun to rise from east; then cause it to rise from the west"\n2) Chapter 06:Verse158:- "The day (ie. Portents of the hour e.g., sun rising from the west)that some of the signs of your Lord (Allah) do come, no good will it do to a person to believe then, if he believed not before, nor earned good through his faith"\n\nProof from Narrations of Prophet Muhammed (peace be upon him):- Abu Hurayrah(RA) narrated that the messenger of Allah (Pbuh) said, “The day of the hour will not come until the sun rises from the west, if it rises and Allah places His hand at night to forgive his morning sinners, and places in the morning to forgive his night sinners until the sun rises from the west” (Sahih Muslim).
1094061
Earth is revolving in orbit, held in place by the Sun's gravitational pull