0
Eratosthenes (a greek) was the first person known to have accurately measured earth's radius. He did that about 250 BCE. The trick was to measure the length of the shadow cast by the library at Alexandria during the summer solstice, and knowing the distance between Alexandria and Cyene--a city on the Tropic of Cancer. A bit of trigonometry, and earth's radius falls right out.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
How do you calculate radius of the circle when you do not have diameter?
Double the Radius to Calculate the Diameter.
How to calculate Length of long-radius elbow?
how to calculate the elbow radius or elbow length
Is the earths radius and surface area increasing?
no
How do you calculate radius of rotation?
From what? You need other variables you can use in the standard circle formulae from which to calculate the radius.
How do you calculate radius from pipe diameter?
diameter = 2 * radius
The planet Neptune's size compared to the other planets?
Mercury's radius (at the equator) = 2440km or 0.3825 x Earths Venus' radius = 6052km or 0.9488 x Earths Earth's radius = 6378km Mars' radius = 3397km or 0.5323 x Earths Jupiter's radius = 71,492km or 11.21 x Earths Saturn's radius = 60,267km or 9.45 x Earths Uranus' radius = 25,557km or 4.01 x Earths Neptune's radius = 24,766km or 3.88 x Earths
How do mercury radius and mass compare with the earths?
Mercurys mean radius is around 2,439.7 km, which is around 38.39% of earth radius or 0.3829 Earths. Mercurys mass is around 3.3022×10 to the 23 kg, around 5.5% of earths mass or 0.055 Earths.
How do you calculate radius of the circle when you do not have diameter?
Double the Radius to Calculate the Diameter.
How to calculate Length of long-radius elbow?
how to calculate the elbow radius or elbow length
Is the earths radius and surface area increasing?
no
How do calculate working radius of a crane?
calculate radius of crane: The radius is always measured from the centre of rotation and is the radius measured after the boom deflects forward when under load.
How many times bigger than the earths radius is the suns radius?
the sun's radius is and half a million bigger than the radius of the sun.
What is the size of the inner planets?
Mercury's radius (at the equator) = 2440km or 0.3825 x EarthsVenus' radius = 6052km or 0.9488 x EarthsEarth's radius = 6378kmMars' radius = 3397km or 0.5323 x Earths
How do you calculate radius of rotation?
From what? You need other variables you can use in the standard circle formulae from which to calculate the radius.
C program on how to calculate circumference of a circle?
int radius = 2; int output; radius = radius * 2; output = radius * Math.PI; Console.WriteLine(output);
How do you calculate the radius of a circle?
The radius of a circle is half of its diameter.
How do you calculate radius from pipe diameter?
diameter = 2 * radius
