how long would a day on the moon be?
371904
A month. That's why we only see one side of the moon. (Hence the Pink Floyd song Dark Side of the Moon). :)
866515
3 days. That is how long all the Apollo missions took. So the round trip is 3 days there, 3 days back, plus however long they stayed in lunar orbit.
758225
I can only assume you need to know how long the moon cycle is and where the half moon falls in the moon cycle.\n\nA moon cycle is 28 days long, so a half moon occurs on the 14th day of the moon cycle, oposite the "New" moon.\n\nHope this helps!
645338
With or without stopping to ask for directions?\n\nIf the moon is (on average) 185,000 miles away and you drive 70 miles an hour, you'll get there in about 2600 hours, or somewhere around 110 days.\n\nRemember the moon is also moving, so you'll have to aim for the point in space where the moon will be when you get there ... and you'd better be going faster than 70 mph when you get there because the Moon won't wait up -- it's revolving around the Earth much faster than that.
78174
The average distance from the Moon to the Earth is 384,403 kilometers (238,857 miles), and its orbit is elliptical.
576939
The average distance from the Moon to the Earth is 384,403 kilometres (238,857 miles
192
Mean Distance of Moon from Earth - 238,712 mi (384,400 km)\nGreatest Distance of Moon from Earth (Apogee) - 252,586 mi (406,740 km) Shortest Distance of Moon from Earth (Perigee) - 221,331 mi (356,410 km)
243834
Yes, the moon goes around the Earth at a much slower rate (28 days) than the Earth spins around once (24 hrs).\nClick on the link to the animation below. Notice how the Earth spins while the part of the moon facing us changes.
283639
A lunar eclipse is much slower than a solar eclipse when viewed from Earth. On average a lunar eclipse is visible from a point on earth for between 4 and 5 hours, a solar eclipse usually lasts 90 minutes.
146839
Here's information from NASA.\nhttp://www.nasa.gov/worldbook/moon_worldbook.html\n\nHere's the wikipedia entry,\nhttp://en.wikipedia.org/wiki/Moon
438648
The Moon has a surface area of 152 million square kilometers.\nThe Earth is 13.5 times larger.
462962
The average distance from earth to moon is 238855 miles.
981946
It depends on how fast your spaceship can travel and the flight path that you use. The distance to travel 385,000 km \n\nThe first man made object that got to the moon was the Russian Luna 2. It impacted with the Moon and scattered Russian pennants on the Lunar surface. The flight duration was 33.5 hours\n\nThe Apollo missions were a bit slower because the spacecraft first had to reconfigure in earth orbit and then had to brake as they approached the moon. Flight duration to the moon just over 60 hours.\n\nAt this stage there are no spaceships, on earth, capable of getting a human to the moon. So if you start tomorrow with a huge budget you should get there in four or five years.
1142453
Well it's a natural phenomenon. If moon is not rotating then some thing else any where else in our solar system will do something to compensate for this energy.\n\nRemember : Energy can neither be created nor be destoyed and according to the energy conservation principle this energy will have to be redirected . So it can be millions of other possibilities :)\n\nLike days will be shorter ans earth rotates fast to use that excess energy or something like that.\n\n:)
534409
Even though the moon is 238,000 miles away in a straight line; it will take several days to reach the moon in a rocket using todays technology. This is because a rocket does not fly in a straight line between earth and the moon - such a trajectroy would require a phenomenal amount of speed and fuel. Rockets fly into orbit, circle the earth several times, and gradually alter their orbit to an orbit which intersects with the moon blah blah blah...\n\nThe international space station is about 220 miles above the earth, and it takes two days to reach it on a space rocket. The rocket has to fly many times around the earth and gradually intercept the ISS.
959
Man has been tracking time for tens of thousands of years.  Beyond the daily cycle of the sun, what is there to use to track time?  The moon and the stars.\n\nIt takes the moon about 29 1/2 days to go around the Earth, about a month.  The word "month" is derived from the same root as the word "moon."\n\nThe Earth revolves around the Sun over the course of a year, but if you don't know that, it appears that the entire universe of stars revolve around the Earth and Sun.  It takes about 365 1/4 days for the stars to go back to where they started, and that makes a year.\n\nSo the moon revolves around the Earth about 12 times a year, and thus we have 12 months.\n\nBut actually it takes fewer than 360 days for the moon to go around the Earth 12 times.  The months had to be lengthened so that 12 months match one year.  (Other societies used lunar calendars, which kept the month based on the moon's cycle.)  30 days per month would still make the year too short, and 31 days per month would make the year too long.  Thus we have some months 30 days and others 31 (and one other).\n\nEven still, the length of the year doesn't exactly match the revolution of the Earth around the Sun, so we make adjustments.  Every four years, we add a day to February.\n\nAnd still it's not perfect, so every 400 years, we don't add that day to February.\n\nAs for why February starts with only 28 days is not known for sure.  There have been different explanations, but it comes down to someone a long time ago making a pretty odd decision.
969045
Are you taking into account the radius of the moon? The equations you've provided treat "r" as the distance between the centers of mass of each object. Therefore:\n\nr = radius of the moon + distance from it's surface\n\nr = 1785 km + 111 km\n\nr = 1,896,000 m\n\nSubstituting this into your equations provides:\n\nT = 2*pi*sqrt((1896000)^3/(6.674x10^-11 * 7.3x10^22))\n\nT = 7431.6 s = 123.9 min\n\nAdditionally:\n\nV = sqrt((6.674x10^-11 * 7.3x10^22) / 1896000)\n\nV = 1603 m/s\n\nHope that clears things up a bit! :)