How fast is Earth moving?

Catastrophe

"Science begets knowledge, opinion ignorance.
"There is no chance that you'll be flung off to space right now, because the Earth's gravity is so strong compared to its spinning motion. (This latter motion is called centripetal acceleration.) At its strongest point, which is at the equator, centripetal acceleration only counteracts Earth's gravity by about 0.3 percent. "

How cruel to keep you reading nearly to the bottom, before you get this reassurance.
I bet you were biting your fingernails with worry?

Cat :) :) :)
 
The article said about how fast, "Since speed is equal to the distance traveled over the time taken, Earth's speed is calculated by dividing 584 million miles (940 million km) by 365.25 days and dividing that result by 24 hours to get miles per hour or km per hour. So, Earth travels about 1.6 million miles (2.6 million km) a day, or 66,627 mph (107,226 km/h)."

However, this assumes the distance between the Earth and Sun is accurately known, i.e. the astronomical unit. Geocentric astronomy was the norm with Earth viewed as immovable from the days of Claudius Ptolemy through Tycho Brahe. In geocentric solar system, the distance between Earth and Sun was much smaller than today's heliocentric solar system. Measured in earth radii, most considered that distance to be about 1200 earth radii compared to present day value near 24,000 earth radii. Galileo's observations at Jupiter challenged geocentric thinking but did not settle the debate in astronomy. Parallax is mentioned in the report but telescopes did not measure parallax until 1838 using the star, 61 Cygni. Explaining retrograde motion was done in geocentric astronomy using Claudius Ptolemy circles and epicycles with smaller circles. So there was much in geocentric astronomy and observation that could be used to show the Earth was immovable and the Sun moved around the Earth. Tycho considered the planets and Sun moved around the immovable Earth.

Exactly what observations in astronomy show the Earth is moving and not immovable is something to dive into in astronomy.
 
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