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19.2 rE
The Earth's orbit is very nearly a circle, with the Sun very nearly at the center of the circle. The average distance of the Earth from the Sun ... the radius of the circle ... is 93 million miles.
1,800 light years away. it is hotter than our sun (6200 Kelvin) and the radius 195 times that of the Sun, which makes the star almost as big as the Earth's orbit.
by the earths rotation around the sun and the pattern in day and night and how the earth moves and how the earth revolves and rotate around the sun.
Regulus is 77.5 light-years away from our solar system. (The diameter of Earth's orbital radius is 16 light-MINUTES, so our orbit around the Sun doesn't make any significant difference.)
The sun's radius
The sun has a radius of approx 696,000 kilometres. By way of comparison, the earth's radius in 6,371 km.
Earth will be a little colder on parts
Arcturus has a radius about 26 times that of our Sun.Our Sun has a radius about 109 times that of Earth.So a quick bit of math: 109 x 26 = 2,834 times that of Earth
You can approximate Earth's orbit as a circle, and therefore use the formula for the circumference of a circle. The radius is the distance Sun-Earth (150 million kilometers).
about a million degrease
The Earth is 1 AU from the Sun, not the diameter. See related question.
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)
The sun is 695,500 km in radius, while the earth's radius is only 6378 km. This means that if the sun was about as tall as a regular desk, the earth would be the size of a small paperclip. You could fit about 1,000,000 whole earths inside of the sun, (slightly more or less depending on how you arranged them). The sun is also very dense, and weighs 332,900 times as much as the earth. In the related links section, you can find a to-scale picture of the sun next to the earth.
19.2 rE
One Astronomical Unit (abbreviated AU) is the distance from the Sun to the Earth, which is 93 million miles. So the Earth's orbital radius 1 AU.
The Sun has a radius 100 times that of the Earth which means that about 1,000,000 (1 million) Earths would fit into the Sun!