what in our solar system determines a week? We have 24 hours, a month, a year, but about a week, I dont know.?
435661
The week based on the 6 days it took God to make the universe and rested on the seventh day. Thats the week but the week is composed of the 24 hour periods where we spin fully. The year where we revolve around the sun in 365 days.\n\nI hope that answers your question
717718
In the time it takes the Earth to make one turn on its axis relative to the stars, it also moves relative to the Sun. So a day later, the Sun is not in the same spot relative to the stars and the Earth has to rotate for about another 4 minutes to put the Sun back in the same apparent position.  \n\nThe actual length of a Solar days varies during the year, because the Earth's orbit is elliptical, and the orbital speed varies slightly. If you rely on a sundial to tell time, it will run fast and slow by about 15 minutes in the course of a year. Our 24-hour standard day is the average of the variations, and so is called a Mean Solar Day.\n\nThe sidereal day, on the other hand, is precise to a minute fraction of a second - the Earth does wobble a little and is very gradually slowing down besides, so it's not perfectly repeatable.
480279
because it relies to the events which can't be measured metrically anyway. Weeks follow the approximate lunar circle, there's 365 days in a year etc.\n\nalso, imagine we would divide a day into 100 hours. 1 hour would last only 14 minutes, which would be way too few and confusing. \nIf we divided a day into 10 hours, an hour would last 2 hours and 64 minutes. this would probably be too long, and we wouldn't have enough hours to properly determine a time of day...\n\nAn hour was determined as 1/4 of the time when the shadow of a pole travels a 60 degree angle or something... i THINK. I might be wrong on this, high school phisics is a LONG time ago. \nAnyway, it was old Sumerians or Babilonians who determined it like that and ever since it wasn't changed. We're too used to these units now, we can't just change them without causing a massive MESS :D
887300
There are 2 astronomical cycles involved here.\n\nThere's a 19 year cycle, where moon, sun-earth are in same relative positions all year long.\nThere exists an eclipse cycle here but not like the saros cycle, below.\n\nThe other is the "saros" cycle, (the eclipse cycle), which is 18 years, 11 days 12 hours, 3 and 1/3 seconds.\n\nThese are astronomical absolutes--you can depend on them.\n\nI can't decipher your dates above, but after 62 years as an amateur astronomer, I can assure you that my figures above are correct...\n\nI appreciate your interest in these cycles--you are one in about 10,000, (maybe in 100,000) that can even pose such a question.
429628
1 week  = 7 days\n\n1 day   = 24 hours\n\n1 hour  = 60 minutes\n\n1minute = 60 seconds\n\nNow\n\n1 week  = 7 days\n        = 7 x 24 hours\n        = 7 x 24 x 60 minutes\n        = 7 x 24 x 60 x 60 seconds\n        = 604800 seconds\n\n\nhttp://www.schoolingkids.com
787978
Hi, \n\nThe sun's orbit is 365.4 days. The actual length changes very little, but with a period of roughly 41,000 years.\n\nHope that helps, \nMatt
86167
The moon.  Every four weeks there is a "New moon."
1005717
it is actuall slightly less that 24 hours, it is exactly\n\n23 hours, 56 minutes and 4.09 seconds\n\nthat is why we have a leap year built into our calender, to offset the difference between the 24 hour clock and the actual rotational period of the earth
352683
The earth has several different movements. First, it rotates on its axis, which takes 24 hours. During this period, the parts of the earth that face toward the sun experience day, while the parts that face away from the sun experience night. Second, the earth revolves around the sun.. in a large elliptical orbit. This process takes a year. The earth's journey around the sun along with the earth's tilting axis produce the seasons. Third, the earth, sun and other planets are all moving within the galaxy, but this is on a very large scale, and is not really noticeable or of interest to most people.\n\nTo sum up:\nmovement of the earth on its axis: rotation. it takes 24 hours.\nmovement of the earth around the sun: revolution. it takes 365.24 days.
62449
Why 12 Months?\n\n\nThe ancient man found that in a complete cycle of seasons there are twelve cycles of the moon, thus the cycle of seasons, now refered as YERA was mad of 12 months.\n\n365 Days Of A Year?\n\n\nAfter getting men more knowledgeable it was found that one complete cycle of seasons OR the year takes 365 days.\n\n\nAdvancement in observations and clculations suggested that one complete cycle is of 365.242 days, thus in order to kepp the seasons fall the same way on the fixed times it was deviced that one day may be add after four years in February.\n\n\nINTERESTIN\n\n\nThe exact measure of 365.242 days in a year with adjustment of one day every four year required another adjustment of one day at every hundred years. For that Feburary in the year 2000 was to be made of 30 days (one day of leap year and one day of leap century). Unfortunately computerisation in the 20th century could not get information of adding two days and thus we had to accept a clander for 2000 with loss of one day. It means now we have a disadvantage of one day in a complete cycle. This is go on increasing in future if not checked earlier. With this milliniums later June will fall in severe cold in the northen hamesphire.\n\n\nEquaual Days in a Month?\n\n\nThere had been different efforts on international level to depict a system in which every month starts the same day and every month has the same number of days but so far nothing could have been developed.
1038294
The way it was told to me was that the ancient Greeks and Romans decided on one day each for the sun, the moon, Mercury, Venus, Mars, Saturn and Jupiter, the planets visible to the naked eye.  This actually is still reflected in the French names for the days and somewhat it the English names for the days of the week.\n\nLundi - Monday - Moon (la Lune)\nMardi - Tuesday - Mars\nMercredi - Wednesday - Mercury\nJeudi - Thursday - Jupiter\nVendredi - Friday - Venus\nSamedi - Saturday - Saturn\nDimanche - Sunday - Sun
582503
A day is the length of time that it takes for the earth to rotate once. There is a slight difference depending on whether you use the sun for the reference point or a star. The solar day (when the sun is used) is 24 hours. The siderial day (when a star is used) is 23 hours 56 minutes. The difference is because the earth also orbits the sun and so it takes a bit longer to realign with the sun than it does with a star.
679596
Because an hour was defined such that there are 24 in a day.\n\nThe length of a day is getting longer though but it is still pretty damn close to 24 hours (and anyone who gives you 23 hours 56 minutes for the day length (or 24 hours 37 minutes for a Martian day) is a person who does not know what they are talking about.
272482
When the Sun was born. ;)  4.6 billion years ago.
447171
24 x 365\n\n24 hours in a day times 365 days
55904
Ask about something that you have always wanted to know. like: what are the origins of the days of the week?
220183
Simple way to look at this perinnial question. One solar system. One planet like earth froms. Sustains life. Universe is filled with billions of stars. Some the size of our Sun. Some have planets revolving round them. Like earth too. Take a wild guess and u wont be wrong. \n;-)