Re: how did the ancient greeks know that the sun (or earth's) orbitwas not circular?
- From: "canopus56" <canopus56@xxxxxxxxx>
- Date: 8 Oct 2005 20:20:06 -0700
X-Archive: No
mack wrote:
> Thanks Joe
Your're welcome. I also decided to pick up a copy of the Evans _The
Practice and History of Ancient Astronomy_. In addition to looking
interesting, it might be useful for some demos at school star parties.
> know about these but I should start going to wikipedia more often.
> > To aid in his measurements,
The supposed Hipparchus picture on Wikipedia -
http://en.wikipedia.org/wiki/Image:Hippachus_000A.jpg
also shows the use of the cross-staff, another ancient instrument for
measuring the angle between two celestial objects.
- Canopus56
.
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