Around 240 BC.
Head circumference of 3 year old?
Earth travels approximately 584 million miles around the sun each year in its elliptical orbit.
Use a Caterpillar!
what is the average head circumference of a 5 year old boy
No, the circumference of the Earth actually changes slightly over time due to factors such as tectonic plate movement, sea level changes, and gravitational forces. Overall, the changes are minimal and not easily noticeable on a human timescale.
It might actually be a really good idea to move the Earth farther away from the sun, giving the Earth a larger orbital circumference and a longer year. The Earth would also receive less sunlight, and therefore it would be less susceptible to overheating, which is an issue of great concern at the present time. However, we do not have any technology that is capable of altering the Earth's orbit. It would be extremely difficult to do, and very likely, we will never do such a thing, however useful it might be.
To calculate this speed, you need some more numbers, not just the distance from Earth to Sun. You need to know:* The gravitational constant * The distance from Earth to Sun * The mass of the Sun You DON'T need the mass of the Earth. Assume any mass; you can just call the mass of the Earth "m". Then calculate an expression for the gravitational attraction between Earth and Sun. Divide by the mass of the Earth, and you get a centripetal acceleration. Assuming a circular orbit for simplicity, the centripetal acceleration must be just this force. Use the formula for the centripetal acceleration along a circle (a = v squared / radius). (Don't forget to convert the distance from Earth to Sun, to meters!) Solve for "v".
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The Earth makes a full turn around the sun once every year, knowing that and the circumference of the orbit you can calculcate the speed of earth which is approximately: distance / time = 30 km/s
The "year", in this case, refers to how long the planet takes to orbit the Sun. Uranus is farther away from the Sun; as a result, its orbit has a larger circumference AND it moves more slowly.
The earth's path around the sun is not a perfect circle. But it's close, and in order to answerthis question, we'll assume that it is.The earth's average distance from the sun ... the radius of the "circle" ... is 93 million miles.The distance traveled by earth around the sun in a year ... the circumference of the circle ... is(2 pi) times (radius) = 584.3 million miles(rounded)
Sirius is a star, so it doesn't have an orbit like the planets do. Thus, you can't calculate a year for Sirius. All you can do is estimate its age in Earth years.