positions and velocity of planets

aloah!

i've been googling for this now since 3 hours... maybe here somebody can
help me...
i need a table of positions and velocity vectors of the planets of our
solsystem... (relative to sun would be wonderful)
got anybody something like that?
please help

so long,
JF

"Jan Frederick Eick" writes:

i've been googling for this now since 3 hours... maybe here somebody can
help me...
i need a table of positions and velocity vectors of the planets of our
solsystem... (relative to sun would be wonderful)

Since the positions and velocities of the planets are constantly changing,
such a "table," by its very nature, could not possibly be static. You can
only have such a "table" as of a particular instant in time.

Furthermore, while astronomers do calculate heliocentric planetary positions,
only the people at NASA and JPL care particularly about planetary velocities.


got anybody something like that?

HINT: Try googling on "ephemeris."


-- Gordon D. Pusch

perl -e '$_ = \n"; s/NO\.//; s/SPAM\.//; print;'

Gordon D. Pusch wrote:
"Jan Frederick Eick" writes:

i've been googling for this now since 3 hours... maybe here somebody can
help me...
i need a table of positions and velocity vectors of the planets of our
solsystem... (relative to sun would be wonderful)

Since the positions and velocities of the planets are constantly changing,
such a "table," by its very nature, could not possibly be static. You can
only have such a "table" as of a particular instant in time.

Furthermore, while astronomers do calculate heliocentric planetary positions,
only the people at NASA and JPL care particularly about planetary velocities.

Nit: so do the people doing high-resolution planetary and comet
spectra in the infrared, where the relative velocities of Earth
and target (sometimes even hour angle) make all the difference
in whether a certain spectral feature is or is not wiped out
by our atmosphere...

Bill Keel

"William C. Keel" wrote in message ...
Gordon D. Pusch wrote:
Since the positions and velocities of the planets are constantly changing,
such a "table," by its very nature, could not possibly be static. You can
only have such a "table" as of a particular instant in time.

Furthermore, while astronomers do calculate heliocentric planetary positions,
only the people at NASA and JPL care particularly about planetary velocities.

Nit: so do the people doing high-resolution planetary and comet
spectra in the infrared, where the relative velocities of Earth
and target (sometimes even hour angle) make all the difference
in whether a certain spectral feature is or is not wiped out
by our atmosphere...

More so, scientists who use spectroscopy to measure radial
velocity must very accurately subtract the velocity of
the location of the observatory on Earth's surface relative
to the Solar System at any given moment. Consider that
Earth orbits at ~30 km/s and rotates at the equator at
~465 m/s, whereas doppler velocity measurements can be
accurate to a few m/s.