The most precise method is laser ranging.
Lasers are "fired" at the Moon aiming for specific reflectors (retroreflectors) that were positioned there during the Apollo landings. The time taken for the return trip is used to calculate the exact distance.
Equipment needed:
A yardstick or meter stick, tape measure?
A piece of notebook paper
A few minutes of un-obscured Moon
Procedure:
1) You may need to recruit some assistance. Holding the yardstick up to your eye, move the paper along the stick until one of the holes just barely contains the outer rim of the moon. A steady stick may be problematic, so you may want to rest it on a chair, ladder, or other object while the paper is moved. Also, you may need to recruit help as the distance between your eye and the paper may exceed your arm length. Try to be as accurate as possible. Once you've reached the location where the hole just contains the moon, record the distance between your eye and the paper in the spaces below. It would be best if you record the distances initially in metric units, but you can convert later if you don't have metric units printed on your yardstick. Repeat this 3 times to lessen the experimental error. Don't forget your units.
Distance #1: Distance #2: Distance #3:
Now, average your readings. Distanceavg = Davg =
Now, if you used English standard units (inches), convert to metric using 1 inch = 2.54 cm.
Davg (in) * 2.54cm/1 inch =
Next, we need to find the diameter of the hole used. It can be tricky to determine the largest diameter using a ruler, so you'll need to perform this measurement 3 times as well by removing the measuring device and placing it over the hole each time you measure it. Remember, use metric units it you can or just convert using the same method as above for converting the distance.
Diameter #1: Diameter #2: Diameter #3:
Now, average the diameters: Diameteravg = davg =
2) This method uses simple geometry. We now have an estimate on the distance between your eye and the hole, as well as the diameter of the hole. Using similar triangles, and the fact that the
Moon has a diameter of about 3475 km, we can attempt to estimate the distance to the moon. Similar triangles will lead to the following formula:
davg/Davg=Diameter of the moon/x
Solving for x leads to
x=(diameter of the moon)(Davg)/davg
Before you calculate your result, make sure that your average distance and average diameter are in the same units, otherwise you'll need to convert. If your diameter and distance units are the same, then they'll cancel each other and your answer will be in km. Calculate your result in the space here:
Scientists have reflective things on the moon and they shine lasers up at it to measure how far away the moon is. _____________________ Before the Apollo astronauts left the laser reflectors on the Moon, there was RADAR!
1. RADAR.
2. It doesn't matter how large an object is; its distance is directly related to its orbit. Measure the precise time that it takes for the Moon to go around the Earth once, and you can calculate how far away it is.
3. Parallax; measure the position of the Moon against the background stars from two points on opposite sides of the Earth at the same moment. You can calculate the distance from the parallax.
Yes. Scientists had calculated the distance to the Moon many years ago, but there was some measure of error in the precise dimensions of the Moon's orbit. Not by much; we can measure with a stopwatch how long it takes for the Moon to orbit the Earth, and that lets us calculate the distance to the Moon pretty accurately; within a couple of miles, or so.
And the US Air Force routinely calibrated their long-range radars by measuring the distance to the Moon.
But one of the items left on the Moon by the Apollo 11 astronauts was a "corner reflector", which allows scientists to measure the distance to within a few millimeters by shining a laser at the Moon and seeing the bright reflection.
We need a coin and a tape measure.
Tape the coin onto a window pane that you can see the moon through.
Step back until the apparent size of the coin and moon are the same.
Measure the distance from the coin (cm) to your eye and the diameter of the coin (cm).
The moon's diameter is 3474 km
We know the ratio of the moon's distance from your eye to its diameter is the same as the ratio of the coins distance to your eye to its diameter.
Thus, using all distances and measurements in cm):
(Moon's distance)/(Moon's Diameter)=(Coin's distance)/(Coin's diameter)
Rearranging:
Moon's distance = (Moon's diameter)x(Coin's distance)/(Coin's Diameter)
This is the moon's distance in cm so divide by 100,000 to convert it to kilometers
293,000 mi's away
Today we measure the distance with lasers or radar
Because light can not reach as far as a laser.
Basically they start a clock when the laser is turned on, then they stop it when they receive a weak pulse of laser light that has been reflected back to Earth from the moon.
The distance from the Sun to the Earth varies about 3% over the course of a year, from a minimum or "perihelion" distance of about 91,500,000 miles to a maximum or "aphelion" distance of about 94,500,000 miles. 93 million miles is a good average figure. Details of how to measure this distance are given later. The speed of light is approximately 186,000 miles per second, or 300,000 kilometers per second. With an average distance of 93 million miles and an approximate speed of light of 186,000 miles per second, the math becomes really easy; it takes light 500 seconds to reach the Earth. Here's one method of how to measure the distance to the Sun, using radar technology: (You can't use radar to measure the distance to the Sun directly because of the nature of the Sun's surface.) 1) Wait for Earth, Venus and the Sun to line up with Venus (more or less) directly between us and the Sun. 2) Measure the distance to Venus using radar. 3) Knowing the Earth to Venus distance, use Kepler's Third Law to find the Earth to Sun distance. (Kepler's Third Law will give the ratio of the distances of Earth and Venus from the Sun. Thus, knowing the Earth to Venus distance, you can find the Earth to Sun distance.) See the "Related Link" below for more about measuring the distance to the Sun.
No. The changing distance between the earth and sun in the course of a year has a small effect on the climate variations at various places on earth, but so small that you'd never notice it, and it's not at all the reason for the seasons on earth. There are two big things wrong with this concept: 1). The closest that the earth ever gets to the sun in the course of the year happens in ..... (get ready for this) ..... in JANUARY ! Right in the coldest part of the Winter in North America. If the weather tracked the earth's distance from the sun, then how could you explain this ? 2). During Winter in the Northern Hemisphere ... December to March ... it's Summer at exactly the same time in the Southern Hemisphere ... places like Brazil, Argentina, and Australia. So at different places on the earth, you have a Summer and a Winter going on at the exact same time. It can't have anything to do with the earth's distance from the sun. These two facts prove that the answer to your question is definitely 'no'. Naturally, the next part of the story is to explain what does cause the change of seasons on the earth. That discussion appears in several different places here on WikiAnswers. If you can't find it, post the question again: "What causes the changes in earth's seasons ?", and I'm sure you'll get an answer to that one right away.
just read a bible to find a exact answer
The circumference of the earth at the equator is 40,075.02 Km. So therefore the distance travels in 1 hour is equal to 40075.02/24 which equals 1669.79 Km each hour that is a rough calculation, where the distinction between solar days and celestial days is not taken into account. in a solar day, the earth actually rotates 360 plus 360/365 degrees. roughly 1.003 revolutions, which is 40,185 km. this divided by 24 equals 1674 km
Mars would have to find more mass if it wanted to equal the Earth's. It has only 11% of Earth's mass.
lasers to find speed and gps to find location/distance
Find the distance from the earth to the moon, then the the distance from the earth to the sun, and simply subtract the both.
Approximate.
you use latitude and longitude to find exact locations on earth.
Just go to Ebay and search green lasers and you'll get some results
To find the distance between the Earth and Moon you would use Lunar distance. Lunar distance is the measurement from and to the Earth and Moon which calculates 238,900 miles
Laser light.
Earth is the third planet from the sun at a distance of 149.6 million kilometers.
I very much regret that the exact percentage is not known since no one has managed to find a way to find the exact mass of the earth's crust, which would probably form the denominator of such a percentage.
We need to know the reference point and distance.
Laserbtb is a website that exclusively sells lasers, including 50mW green lasers, as well as safety equipment to wear when using lasers. Lasers can also be found on Amazon, and eBay as well.
Maps are flat and Earth is round