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View Full Version : The diamter of the Earth is 7,800 miles?



CMartin
2004-Mar-18, 09:32 PM
I always thought the Earth's diameter was about 12,000 miles. However, this NASA article implies otherwise:

http://neo.jpl.nasa.gov/news/news142.html

"The object, designated 2004 FH, is roughly 30 meters (100 feet) in diameter and will pass just 43,000 km (26,500 miles, or about 3.4 Earth diameters) above the Earth's surface on March 18th at 5:08 PM EST (2:08 PM PST, 22:08 UTC)."

26,500 divided by 3.4=7794.11

Is our planet truly that small? Am I thinking of the circumference.

TriangleMan
2004-Mar-18, 09:48 PM
This site (http://geography.about.com/library/faq/blqzcircumference.htm) has the circumference at the equator at 24,901 miles.

Circumference = d(pi)
d = 7,926 miles.

tracer
2004-Mar-18, 10:13 PM
I always thought the Earth's diameter was about 12,000 miles.
Perhaps you got miles confused with kilometers.

AGN Fuel
2004-Mar-18, 11:30 PM
I always thought the Earth's diameter was about 12,000 miles. However, this NASA article implies otherwise:

http://neo.jpl.nasa.gov/news/news142.html

"The object, designated 2004 FH, is roughly 30 meters (100 feet) in diameter and will pass just 43,000 km (26,500 miles, or about 3.4 Earth diameters) above the Earth's surface on March 18th at 5:08 PM EST (2:08 PM PST, 22:08 UTC)."

26,500 divided by 3.4=7794.11

Is our planet truly that small? Am I thinking of the circumference.

You are thinking of kilometres. Diameter of the Earth is ~12,760km.

JohnOwens
2004-Mar-19, 07:21 AM
I always thought the Earth's diameter was about 12,000 miles. However, this NASA article implies otherwise:

http://neo.jpl.nasa.gov/news/news142.html

"The object, designated 2004 FH, is roughly 30 meters (100 feet) in diameter and will pass just 43,000 km (26,500 miles, or about 3.4 Earth diameters) above the Earth's surface on March 18th at 5:08 PM EST (2:08 PM PST, 22:08 UTC)."

26,500 divided by 3.4=7794.11

Is our planet truly that small? Am I thinking of the circumference.

You are thinking of kilometres. Diameter of the Earth is ~12,760km.

Or were thinking of the distance pole-to-pole on the surface, which would be about 12,440 miles.

CMartin
2004-Mar-19, 06:22 PM
Thanks for clearing that up for me- I'm going to go along with I got my kilometers and miles mixed up.

swansont
2004-Mar-19, 10:02 PM
Thanks for clearing that up for me- I'm going to go along with I got my kilometers and miles mixed up.

Did you by any chance work on the mars lander project?

ZaphodBeeblebrox
2004-Mar-19, 11:13 PM
Thanks for clearing that up for me- I'm going to go along with I got my kilometers and miles mixed up.

Did you by any chance work on the mars lander project?

Now c'mon, don't say Things we can't Take Back ...

:lol:

Karthesios
2004-Mar-20, 08:21 AM
...I always used 7928 as the Earth's diameter in miles...

tracer
2004-Mar-22, 05:36 AM
Maybe the article was in Nautical miles.

(No, wait ... then the Earth's diameter would have been given as only 6890 "miles". Darn it!)