2006-06-28 03:30:50 · 15 answers · asked by sphinx63 1 in Science & Mathematics ➔ Earth Sciences & Geology
no. it changes over millions of years as the universe changes and our relationship to the sun changes, but i'd guess it was pretty close as to what is now.
2006-06-28 03:34:09 · answer #1 · answered by Anonymous · 1⤊ 0⤋
No it has not, it is actually slowing down. The physics of gravity predict that energy is radiated as a body interacts with other bodies. Several years ago a turtle shell was discovered on an island in the pacific. This turtle shell had a drawing of an eclipse. Since the position of the island was known, and the shell could be very accurately dated it was determined that the shell was approximately 5 thousand years old, and that we could determine what the position of the earth and the moon were on that specific date. It required the earth to have slowed down between that day and our current day by several seconds. Each year at newyears in order to keep our calender and our clocks in synch with the rotation of the earth a leap second may be added to adjust for the slowing of the earth.
2006-06-28 03:37:41 · answer #2 · answered by Brian_lord 1 · 0⤊ 0⤋
No, it is very slowly, slowing down. Back in 1998 we had a leap second to counteract the Earth's slowing rotation. The drag of the Moon's gravity and the effect of the modulus of rotation are all factors in slowing the Earth down. A billion years from now it is unlikely that any of the minor planets will exhibit axial rotation at all. Jules, lecturer. Australia.
2006-06-28 03:39:13 · answer #3 · answered by Jules G 6 · 0⤊ 0⤋
When you spin a top, it starts fast then begins to slow down due to friction and gravity. The same thing goes for the Earth, it is slowing but nowhere near as fast because of the vacuum of space.
The Earth is slowing about 1.5 milliseconds per century. That means an Earth day is about *one* second longer than it was when humans first appeared nearly a million years ago.
On the link, scroll down to "EFFECT OF TIDES ON EARTH'S ROTATION".
2006-06-28 03:38:36 · answer #4 · answered by Anonymous · 0⤊ 0⤋
No, the earth's spin is being slowed due to friction of the tides against the continents. The amount of slowing varies according to the number and placement of the continents, which itself varies over time because of plate tectonics (continental drift).
There is geological evidence that indicates that 600 million years ago, the length of the day was about 22 hours.
2006-06-28 03:43:49 · answer #5 · answered by Keith P 7 · 0⤊ 0⤋
no, historians and the astrology geeks have found proof that the earth is slowing down, so within 25 million years, there may be 25 hours instead of 24 in a day, the theory is that every 100,000 years or so an hour is added on.
2006-06-28 03:35:10 · answer #6 · answered by Beth_Bitch 1 · 0⤊ 0⤋
No,it's slowing down. We add a leap second to time every year or so. If you have a GPS unit that gets time from the satellites it'll be off by 15 seconds or so (don't remember the amount and it's been 3 years since I've had to deal with it.)
2006-06-28 05:54:56 · answer #7 · answered by Anonymous · 0⤊ 0⤋
no, it's slowing down. over millions of years our days are getting longer and we are getting slightly closer to the sun. the sun will go supernova long before we ever fall in, though. i read somewhere that the sinodic period has slowed down by as much as 3 hours in the ast 200 years, but that seems pretty exreme to me.
2006-06-28 03:36:01 · answer #8 · answered by Anonymous · 0⤊ 0⤋
no, The earth is moving faster and closer to the sun
2006-06-28 03:33:49 · answer #9 · answered by Anonymous · 0⤊ 0⤋
its moving slower till it gets to a point and stops to spin the other way around
2006-06-28 03:36:36 · answer #10 · answered by Anonymous · 0⤊ 0⤋