How many inches is the planet Mars?

Answer 1

Though the question has a certain amount of novel interest the requirements of the asker are uncertain.

The distance to Mars, from the sun, at aphelion is 249,209,300 Km and 206,669,000 Km at perihelion. (These figures are not accurate to an inch and it is unlikely that they ever could be.) These are the furthest and closest it approches the sun respectively.

Its orbit is superior to the earths orbit so the distance from earth varies by a huge amount.

Its equatorial diameter is 6,792.4 Km with an error of plus or minus 0.1 km (100 meters) the polar diameter is 6,752.4 km, with the same margin of error.

As SI units are used throughout the scientific community the asker will need to convert the figures given into the appropriate units required depending on the accuracy needed. Though this becomes a mute point as the distances and sizes quoted are not known to such a level of accuracy.

It should also be noted if the measurements involved ever do become know to such precision it would be necessary to state the exact time the measurements are required because of the relative movement involved.

Even the diameters would alter to a certain degree due to tidal forces.