Patrick, ALL orbital calculations require the perihelion epoch. I believe it is also called the arguement of perihelion. It is the data point that tells where the comet is in its orbit - a boundary condition. It was the last three entries you sent. My confusion was that my version of TheSky asked for them first. After I recognized them, things worked great. Thanks for the URL for elements. Brent --- Patrick Wiggins <paw@trilobyte.net> wrote:
Hi Brent,
Brent Watson wrote:
What is the epoch of perihelion?
Sorry but since neither of my astronomy programs need that bit of data, I didn't bother to get it.
FYI, the place I get my elements is http://cfa-www.harvard.edu/iau/MPEph/MPEph.html .
Patrick
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