JT wrote:
On 21 Sep, 03:47, "Bast" wrote:
RichD wrote:
When and how did astronomers determine that the earth's axis
tilts from the ecliptic, and its value?

I guess the answer depends on who you ask.

http://search.yahoo.com/search;_ylt=...Ed5ebvZx4?p=Wh...

Just like Galileo is often credited for claiming the earth went around
the sun.
His research was based on Copernicus's work, and who knows where
Copernicus got the idea.

He used data collected by Tycho Brahe



That would be a neat trick considering, I believe, Tycho Brache was born
after Copernicus died.