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Requires "kepler.inc" found at the following site, and which I've
renamed to "fbruder_kepler.inc".
http://frankbruder.fr.ohost.de/pov_en.html
Planet positions should be accurate as of yesterday or thereabouts.
Still need to know:
a)* the starting angle of each planet WRT its rotational period
b)** the starting angle of each planet WRT its obliqueness
c) the point in time to use as a reference point for a and b
d)*** the point in space to use as a reference point for a and b
* (e.g. what side of the planet was facing <insert reference point> at
the given starting time or epoch?)
** (e.g. what direction was/is the planet leaning toward?)
*** (e.g. the periapsis)
--
http://isometricland.com
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Attachments:
Download 'test_orbital_characteristics.pov.txt' (7 KB)
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Forgot that there's a macro missing from what I posted:
#macro m_KeplerPosition_trans(i, Omega, w, epsilon, a, P, tau, tol, t_clock)
transform
{
translate a * m_orbitalPosition
(
epsilon,
2 * pi * (t_clock-tau)/P,
2 * pi * tol/P
)
rotate <0, -w, 0>
rotate <-i, -Omega, 0>
}
#end
Just add it to "fbruder_kepler.inc", or to the scene file if you want.
--
http://isometricland.com
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Le 2010-06-29 23:48, SharkD a écrit :
> Forgot that there's a macro missing from what I posted:
>
>
> #macro m_KeplerPosition_trans(i, Omega, w, epsilon, a, P, tau, tol,
> t_clock)
> transform
> {
> translate a * m_orbitalPosition
> (
> epsilon,
> 2 * pi * (t_clock-tau)/P,
> 2 * pi * tol/P
> )
> rotate <0, -w, 0>
> rotate <-i, -Omega, 0>
> }
> #end
>
>
> Just add it to "fbruder_kepler.inc", or to the scene file if you want.
>
>
Also missing:
m_orbitalPosition()
Alain
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On 6/30/2010 2:34 PM, Alain wrote:
>
> Also missing:
> m_orbitalPosition()
>
>
> Alain
No... that one should be in the include file. See:
http://frankbruder.fr.ohost.de/POV/KEPLER.INC.gz
--
http://isometricland.com
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OK, I think I got the rotation part working. At least, when compared to
what Celestia shows for the same Julian date.
Still not sure what to do about obliqueness. I know that the number I'm
looking for is the planet's equinox, but can't locate it within the
HORIZONS query results (except for Earth of course).
--
http://isometricland.com
Post a reply to this message
Attachments:
Download 'test_orbital_characteristics.pov.txt' (10 KB)
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