**The ancient Greeks**, who knew the Earth to be a sphere, were the first to use globes to represent the surface of the Earth. Crates of Mallus is said to have made one in about 150 bce.

## Is the shape of the Earth?

The Earth is **an irregularly shaped ellipsoid**.

While the Earth appears to be round when viewed from the vantage point of space, it is actually closer to an ellipsoid. However, even an ellipsoid does not adequately describe the Earth’s unique and ever-changing shape.

## Is the Earth an egg?

**The inside of the earth is layered something like an egg**. Both have a thin, brittle shell. The crust of the earth is broken into pieces, like the cracked shell of a hardboiled egg. The mantle of the earth is like the egg white, and the core of the earth lies in the center, like the egg yolk.

### How did Eratosthenes prove that the Earth is round?

Eratosthenes then measured the angle of a shadow cast by a stick at noon on the summer solstice in Alexandria, and found it made an angle of about 7.2 degrees, or about 1/50 of a complete circle. He realized that **if he knew the distance from Alexandria to Syene**, he could easily calculate the circumference of Earth.

### What do we call the two sets of lines that geographers have created to help locate places on a map or globe?

Two types of imaginary reference lines are used to locate positions or points and to make accurate globes and maps. These lines are called **parallels of latitude and meridians of longitude**.

### What is the shape of the earth as described by modern astronomy?

Earth is **an oblate spheroid**. This means it is spherical in shape, but not perfectly round. It has a slightly greater radius at the Equator, the imaginary line running horizontally around the middle of the planet. In addition to bulging in the middle, Earth’s poles are slightly flattened.

### What are spheres in math?

sphere, In geometry, **the set of all points in three-dimensional space lying the same distance (the radius) from a given point (the centre)**, or the result of rotating a circle about one of its diameters. The components and properties of a sphere are analogous to those of a circle.

### How was the shape of the Earth discovered?

**Aristotle** (384-322 BC) was among the first to recognize the fact of our planet being a round sphere. He observed lunar eclipses and noticed that only a round sphere could imply a circular shadow. This astronomical observation was confirmed by general observations made at sea.

### Who discovered Earth revolves around sun?

But in the 1500s, **Nicolaus Copernicus** found that the movements could be predicted with a much simpler system of formulas if both Earth and the planets were orbiting the Sun.

### Who said that earth is round and revolves around the Sun?

In 1543, **Nicolaus Copernicus** detailed his radical theory of the Universe in which the Earth, along with the other planets, rotated around the Sun.

### Is an apple a sphere shape?

**Apples are relatively spherical except** for that characteristic dimple at the top where the stem grows. How do apples grow that distinctive shape?

### What is Pi the number?

Succinctly, pi—which is written as the Greek letter for p, or π—is the ratio of the circumference of any circle to the diameter of that circle. Regardless of the circle’s size, this ratio will always equal pi. In decimal form, the value of pi is **approximately 3.14**.

### What is a cone in math?

cone, in mathematics, **the surface traced by a moving straight line (the generatrix) that always passes through a fixed point (the vertex)**. … The axis of this cone is a line through the vertex and the centre of the circle, the line being perpendicular to the plane of the circle.

### Do we know the shape of the universe?

The exact shape is still a matter of debate in physical cosmology, but experimental data from various independent sources (WMAP, BOOMERanG, and Planck for example) confirm that **the universe is flat with only a 0.4% margin of error**.

### Who thought the Earth was the center of the universe?

In **Copernicus**‘ lifetime, most believed that Earth held its place at the center of the universe. The sun, the stars, and all of the planets revolved around it.

### How will you described Earth?

Earth is the planet we live on, one of eight planets in our solar system and the only known place in the universe to support life. Earth is the third planet from the sun, after Mercury and Venus and before Mars. It is about 150 million kilometers (about 93 million miles) from the sun. … Earth is an oblate spheroid.

### What do you call the imaginary line that divides the places on the Earth in a North south direction?

The Equator is an imaginary line around the middle of the Earth. … It is halfway between the North and South Poles, and divides the Earth into the Northern and Southern Hemispheres.

### What is 0 lat 0 long called?

**The prime meridian** is the line drawn north to south at 0° (0 degrees) longitude. Sentences: The prime meridian divides Earth into the Eastern Hemisphere and the Western Hemisphere. The prime meridian is at 0° (0 degrees) longitude.

### What is the imaginary line that divides the Earth called?

**The Equator**, or line of 0 degrees latitude, divides the Earth into the Northern and Southern hemispheres.

### Who first calculated Earth’s circumference?

**The Greek philosopher Aristotle** (384-322 B.C.) is credited as the first person to try and calculate the size of the Earth by determining its circumference (the length around the equator) He estimated this distance to be 400,000 stades (a stadia is a Greek measurement equaling about 600 feet).

### What was Eratosthenes experiment?

Eratosthenes analyzed **the observations with the assumption that the earth is a sphere and the sun is very far away**. The geometry of the situation is sketched at the right. He concluded that the circumference of the earth was about 50 times greater than the distance from Alexandria to Aswan.

### What shape is a mango?

Its form is **oval, round, heart-shaped, kidney-shaped, or long and slender**. The smallest mangoes are no larger than plums, while others may weigh 1.8 to 2.3 kg (4 to 5 pounds).