explain how we get day and night?
85444
Earth rotates. Sun on one side.
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!
77655
The brain has a separate neural pathway to the optical nerve, separate from the visual path, to detect whether it's day or night.  so when its dark, the brain believes it is nightime and the sleep cycle may inadvertently kick into motion, especially if you're already tired.
1183464
Sky and Telescope and Night Sky
345859
This is one of the strangest questions I have come across along with.... Where does the moon go at night?
698322
Deck the Halls. You need to put a timer on their lights so they come on in the day and turn off at night.
1146317
One question at a time.\n\nThe first one has been answered. Becasue of the earths tilt, countries in the southern hemisphere are closer to the sun in December than the countries in the northern hemisphere - that is why we have winer here (its further away). And when the earth goes around to the other side of its orbit around the sun in July, we in the northern hemisphere are closer, while they are farther. \n\nThis the general rule, however there are many other factors like elevation, precipitation, wind patterns, jet streams, ocean currents etc etc. so yes - every country in the northern hemisphere it is officially summer in july etc. but not necessarily as warm as some other countries can get. and vice versa for the southern hemisphere of course.\n\nAll of us - when we stand up, we are perpendicular to the earths surface no matter where we are. Imagine a ball ... and pins sticking straight out of the ball. This is how we'd look, so to a person on the south POLE, would be upside down to someone on the north POLE. or someone in one area, will be upside to someone else DIRECTLY on the other side the earth's surface. Everyone else will be in varying degrees of "upsidedownness"\n\nDaylight savings time is a pure man made concept. But again ... because of the tilt of the earth, during July etc. the sun shines longer on the northern hemisphere (The days are longer) and the southern hemisphere the days are shorter. This causes the sun to rise earlier and earlier and then after the longest day of the year, it reverses - the days get shorter and shorter. \n\nNow what happens is that you can wake up at 6 am and it still be pitch dark and 7 am it starts to rise and 8 am its fully light. So they change the time to go an hour back (Fall Back) and this allows the time now to be 5 am as pitch dark, 6 am start rise, and 7 am fully light. So for people who wake up at 7 am everyday, the first plan it will be kinda  dark when they wake up but with daylight savings, it will be fully light when they wake up! Thus its just something certain countries do to be able to have light for when most people wake up in the morning - even if you are not a mornig person - about 90% of people wake up at that time to to go to work\n\nHope all this made sense and email me at alxsml@yahoo.com for more clarification.
83573
As all the others said, the sun is a star, and you see it every day. Sometimes, in early morning or in late afternoon, some of the most prominent start may be visible, mostly on the horizon.\n\nAll the stars which you can see by night is still there during the day, but the sun's light is so bright that we cannot see past its brightness to where the stars are.\n\nI once heard in an astronomy class that it is able to see a star in the day, but the light of the star has to fall directly in the mid-center of your eye, and that takes some doing.\n\nLastly, there are certain occasions where stars are visible during the day. I remember when I was in primary school, the Planet Venus (although not a star) was visible next to the moon right in the middle of the day. If Venus can be visible at that time, then why not any other star?\n\nHope I could help you...
35969
The Earth rotates (spins around).  Sometimes a side is facing the Sun and is in daytime.  Sometimes it is not and is in nighttime.
856005
walk the streets day or nights.....\n\nyou'll get both answers---..
1009840
1. Earth's rotation is the reason we have days and nights. Without Earth rotating the sun would shine on one place only and the other side of the planet would be in the dark. Rotation is also the possible reason for its magnetic field.\n\n2. Earth's revolution is the reason for seasons and gravity.
932677
That depends on what side you are on. One side is always daytime the other side is always nighttime.
509348
u might have heard abt latitudes. Sun light constantly falls on earth. as earth moves different past of earth receives light and this is what we term as day and night. Latitudes help in determining times and it takes 15mins for sun to pass from one latitide to another. In other words we have time zones ever heard of green whtch time zone. This way, time is calculated with respect to sunrise and sunset. \n\nThus its all depending on how sunlight reaches in ur region..!
1039610
Go to the first link I've included and join Oprah's book club - it is free.  Follow the links and you will find a huge amount of information there about Night.  \n\nI have included several additional links to help you.  You should be able to find all you need  to write an excellent answer to your question.
1140073
The earth rotates 1 on its axis every 24 hours.  Hipparchus proposed dividing the day equally into 24 hours which came to be known as equinoctial hours (because they are based on 12 hours of daylight and 12 hours of darkness on the days of the Equinoxes). Ordinary people continued to use seasonally varying hours for a long time. Only with the advent of mechanical clocks in Europe in the 14th Century, did the system we use today become common place
1058600
both are always in the sky. sun goes round the earth and the earth goes round the moon. depends on the time of year moon cycles etc etc
956732
you are right,lenght of day depends on : date (position of the earth on it's orbit); location on earth (latitude, elevation);  to calculate day/night lenght, longitude is needed only to find mean time of sunrise/set,noon...in calculs, time should be converted to UTM, dates to Julianian dates.\ni don't know formula to calculate length of day/night,but here's some usefull sites:\nhttp://www.gcstudio.com/suncalc.html\nhttp://susdesign.com/sunangle/\nhttp://aa.usno.navy.mil/faq/docs/equinoxes.html