We know Earth is round and Earth turns the Sun.
http://travelingcosmos.blogspot.kr/2013/12/how-do-we-know-earth-is-round.html
http://travelingcosmos.blogspot.kr/2013/12/how-do-we-know-earth-turns-sun.html
We lives in blue planet, Earth. Let's know about our home, Earth.
1.Earth's orbit
Earth turns the sun. How far earth to the sun? Earth's orbit's radius is about 150000000km, or 1AU. Earth's orbit is ellipse but it is nearly circle. Its eccentricity is about 0.016. Earth's Orbital period is about 365.24days, or1year. Earth's average skidding speed is about 29.8m/s.
2.Earth physical characteristics
Mass:5.97219×1024 kg
Radius:6,371.0 km
Volume:1.08321×1012 km3
Density:5.515 g/cm3
Lowest temperature:−89.2 °C
Average:15 °C
Highest temperature:56.7 °C
Surface pressure:101KPa
Compositon: 78% nitrogen, 21% oxygen 0.93% argon 0.04%carbon dioxide
http://travelingcosmos.blogspot.kr/2013/12/how-do-we-know-earth-is-round.html
http://travelingcosmos.blogspot.kr/2013/12/how-do-we-know-earth-turns-sun.html
We lives in blue planet, Earth. Let's know about our home, Earth.
1.Earth's orbit
Earth turns the sun. How far earth to the sun? Earth's orbit's radius is about 150000000km, or 1AU. Earth's orbit is ellipse but it is nearly circle. Its eccentricity is about 0.016. Earth's Orbital period is about 365.24days, or1year. Earth's average skidding speed is about 29.8m/s.
2.Earth physical characteristics
Mass:5.97219×1024 kg
Radius:6,371.0 km
Volume:1.08321×1012 km3
Density:5.515 g/cm3
Lowest temperature:−89.2 °C
Average:15 °C
Highest temperature:56.7 °C
Surface pressure:101KPa
Compositon: 78% nitrogen, 21% oxygen 0.93% argon 0.04%carbon dioxide
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