The radio waves from a lightning stroke travel at the speed of light, you can hear them as clicks on a long-wave radio, and they travel round the world in 1/7th of a second.
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The sun does not travel around the Earth, Earth travels around the sun. The Earth rotates once every 24 hours.
The Earth completes a full orbit around the Sun once every year. The Earth has existed for approximately 4.5 billion years or so, which means that it has 'gone around the Sun' around 4.5 billion times.
It takes the Earth a year to do this that is 365.25 days.
The earth does not rotate around the sun. The proper term is revolve and it takes a year because that is the definition on a year. It takes the Earth approximatley 365 days to make one trip around the sun. Actually it takes 365 1/4 days a year to revolve around the sun. That is why we have leap years
Earth has seasons because its axis is tilted. Earth's axis is always pointed in the same direction, so different parts of Earth get the Sun's direct rays throughout the year.