Is there a different  time in a different planets?Why?How?
464342
First "time" is relative.  \n\nAs you should know time as we know it is based on the rotation of the Earth, 24 hrs to make one revolution and 365.4 days to go around the Sun.  \n\nMaking the assumption that time is based on the revolutions of the planet you hypothetically happen to be on, time would be different on each planet because the day/night revolutions and the time to go around the Sun are different than on Earth.\n\nIf you were on Mars the Martian year is much longer that the Earth year, as it the day.  If you took you watch to mars and went by it, it would not make much sense on Mars because it is set to Earth time.  \n\nIt  sort of be like if you traveled to Sidney Australia but you were still on New York time and you tried to live like you were still in NY.  It wouldn't work very well.
667841
It is based on the rotation on the earth. Explaining it is too much for a yahoo answer, so the following wikipedia articles will explain this. \n\nThe second wikipedia article explains the 'french' decimal time, in which units of time are divided into slots of 10 each. This is also a lenghtly but comprehensive answer.
483059
Originally, each town set its own local time and 12:00 noon was when the sun was highest in the sky. Thus the time in each town was different. When trains started running, this became annoying in trying to develop schedules. Time zones were created to standardize time over large areas.
838305
B is wrong.  Jupiter spins once every 9 hours and 55 minutes while earth spins once every 24.
754365
for every 15 degrees of longitude, there is essentially 1 hour difference in when the sun rises.  360 degrees/24 hours.   -  that set's up the time zones, basically.\n\nbut - it's not like the time just comes in 1 hour chunks :)\n\nevery degree on longitude is roughly 4 minutes away (sunrise, sunset...that is) from the next degree.  and in there....15 arc-minutes (1/4 degree) = 1 minute.   and so on. :)\n\nand...since the earth is constantly revolving, but we assign the same "local time" to a huge swath of the earth. - every spot on the earth sees the sun rise at a different moment as measured by "local time".\n\n:)
999350
Well, in a very general sense, it's best to view stars and *some* planets between 10pm and midnight.  You'd have to look up the positions of each planet (or the major ones, anyway) to figure out when all of them are in sight.
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..!
627123
The Earth turns one time around in 24 hours and as it does the whole sky seems to turn around the North star. Of course the sky is really not moving at all. The Earth under our feet is turning, but it really does LOOK like the sky is turning! The North star never rises or sets because it is right above Earth's north pole, so as the Earth turns it just stays there in one spot while the whole sky seems to turn around it. Stars close enough to the north star can go around without ever rising or setting. So the sky looks like a big clock, but a 24 hour clock. You may have seen special military clocks that have 24 numbered hours and the hour hand goes once around in a day. It is kind of silly anyway having 12 hours on the clock and making the hour hand go around twice a day. Who made that up?\n\nAnyway, you can use the stars in the sky as your dial and the north star as the center of that dial. Only the dial turns and the hands stay still. Oops, we have no hands! We will just imagine a hand always pointing up and let the dial turn behind it. And there are not really numbers, you have to draw a picture of the stars and write numbers on it so you can compare the sky to it and tell time.\n\nClick the link below for instructions.
471434
The same time as it was one second ago. The only reason it would change would be if the time was like 8:21:59; one second from that would be 8:22.\n :)
614161
I found these charts\nhttp://www.timeanddate.com/worldclock/astronomy.html?n=198\nhttp://www.timeanddate.com/worldclock/astronomy.html?n=136\n\nAs you can see the sunrise off by exactly one half hour on May 5.  Then it slowly diverges, b/c it differs by 1 min each day in philly and often 2 mins in London.  I am sure this is due to latitude.\n\nIt looks like the times are slowly converging the closer we get to the solstice.
745402
Time is like light it curves, and we are part of a time line that can not be changed if it was to do so we would be living in a parallel universe so yes time dose exist.  Oh by the way here is a little test to prove that time dose exist it just dose not matter.  The next time you see some one look at there watch count to 30 and ask them what time it is, the person will then look at there watch again and give you the time.  The point is only 30 sec has gone by yet they had no idea what time it was this is because people do not care what time it is , they care about what time it is not.  they know that there meeting is at 3pm it's only 1pm  there fore they can care less what time it is.  So with that said time exist, but really dose not matter.
725034
An interesting question, which requires thinking carefully about how our common measure of time is related to certain astronomical (solar) positional recurrences.  A lot of people (though not all) have answered you as though the year were exactly 365.25 days long on average, but it's more subtle than that.  \n\nThere are in fact two particular "years" of interest:\n\n1. The sidereal year (period of the Earth's revolution about the Sun with respect to the stars, i.e. operationally, the time for the Sun to apparently "return" to the same position against the stars, after a "year" [crudely 365+ days], as viewed from Earth):\n\n365.256366... days.\n\n2. The tropical year (time for the Sun to cross the celestial equator [the projection of the earth's equator in space] again [e.g. from south to north] after a "year" [crudely 365+ days]).  Alternatively, "the period of revolution of the Earth about the Sun with respect to the Vernal Equinox":\n\n365.242199... days.\n\n(Both figures are quoted to an accuracy sufficient for our present purposes.)\n\nThese two different "years" differ by just ~20.4 minutes, owing to the precession of the Earth.  (One full precession of the Earth's spin axis in space takes ~25781 years.  This long, latter number of years is in fact equal to 365.25 or so days divided by the (essentially observed) "motion of the Vernal Equinox along the celestial equator," at the rate of ~20.4 minutes per year as just mentioned --- check it out.  [Sorry about the technical language, but this is technical stuff.]) \n\nIt's actually the tropical year that determines the rate at which the observed seasons recur, and since we want them to be "at the same time of the year," our long-term timekeeping is geared to the tropical, not the sidereal year.\n\nNotice that at 365.242199 days, this "tropical year" is just a tad short of 365.25 days.  That's why, instead of the simplistic idea of a leap year occurring every 4 years (and having an extra day that accounts "exactly" for 4 x the extra 0.25 days), there will come a time when we've overcounted a bit.  \n\nFor example, after 100 years, we should have had 100 x 0.242199 "extra days," or 24.2199 days.  The "one more day every 4th year" rule would give us 25 extra days per century, ~ 0.78 days more than needed.  If we could drop just 1 day then, that would be better --- but then we'd be under by ~ 0.22 days --- aha! --- close to a quarter of a day!  That's why the revised rule comes in that complete century years are NOT leap years --- UNLESS they're divisible by 400!  (Figure out for yourself from the 365.242199 figure how well this works in the long run.  I think you'll find that the calendar, on average, doesn't get a full day out of step with these revised rules until something like 3,300 years have gone by!) \n\nO.K., so maybe this is much more than you wanted to know.  However, with the right understanding of what the length of the year we usually measure is, 365.242199... days, then 1 million days is 10^6 divided by this, or 2737.90926... years, or 2737 years and 332.10... days.***\n\n*** Remember, this is a mathematically average result, for essentially perfect intervening TROPICAL years (to the accuracy given).  If you want to know it in CALENDAR years and a specific whole number of days, the answer will vary slightly about the preceding result, according to when you start counting. This variability is not just because of the usual "every fourth year is a leap year"  pattern, but also because of the way that century years aren't all treated in the same manner.  It's awkward to give a general rule!  \n\nLive long and prosper.
1025233
Greenwich Mean Time does not change. The world is divided into 24 time zones going east (+) and west (-) from GMT. When we go from EST to EDT we are effectively changing our time zone from R (-5 hours) to Q (-4 hours).
916656
It didn't quite happen that way.\n\nPeople used the sun and sun dials for a long time before our current system of time. Then they started tracking night-time times with water-clocks and similar things.\n\nBut there weren't universally recognized time systems, or such things as our current standard hours and minutes.\n\nWhen clocks (as we know them) began to be made, there wasn't a universal, world-wide time setting.\n\nMonks created the first machines to measure time, to "sound" the time for their religious rituals. (They didn't have universal standards, but varied by place and religious order.)\n\nAround 1330 he got our standard hour.\n\nTowns started building clock towers to sound time for the town (people didn't have their own clocks yet), measuring time from noon to noon or maybe sunset to sunset (or maybe it varied) in 24 1-hour increments.\n\nMinutes came much later.\n\nI don't know when we started world-wide synchronization.
963778
Eliptical orbits. If the orbit were circular, then you'd expect the period to be the same. ...The planet speeds up and slows down and spends more time at the part of the orbit more distant from the sun.
105239
Do you want to know about linear time, or the decay of lifeforms over time?\n\nPeople turn different ages because it's the only way we know. tomorrow is after today. \n\nI don't turn different ages though, I get older.
1009930
Of course people are here all the time... people from all over the world are on here, therefore different people are on at completely different times, due to time zones.