34 lines
1.3 KiB
Python
34 lines
1.3 KiB
Python
"""JPL Planetary and Lunar Ephemeris DE405 for the jplephem package.
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This ephemeris has been the basis for the Astronomical Almanac of the
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United States Naval Observatory since 2003 and powers the Jet Propulsion
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Laboratory's online HORIZONS service. Coordinates and velocities are
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provided for the major planets, the Sun, and Earth's Moon.
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:Name: DE405 (May 1997)
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:Years: 1600 through 2200
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:Planets: Yes
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:Sun/Moon: Yes
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:Nutations: Yes
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:Librations: Yes
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:Report: `Standish (1998) [PDF] <ftp://ssd.jpl.nasa.gov/pub/eph/planets/ioms/de405.iom.pdf>`_
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:Size: 54 MB
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The accuracy of this ephemeris is good; the position of the Earth or
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Mars, for example, should be accurate to within 2 km. But the more
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recent `DE421 <http://pypi.python.org/pypi/de421>`_ ephemeris provides
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greater accuracy, especially with respect to the Moon, and you should
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use it instead if you are planning a space mission. For missions to
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Mercury or Venus, `DE423 <http://pypi.python.org/pypi/de421>`_ will be
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an even better choice.
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See `DE406 <http://pypi.python.org/pypi/de406>`_ if you are interested
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in a similar ephemeris for dates far in the past or future, or `DE422
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<http://pypi.python.org/pypi/de422>`_ if you want high accuracy over a
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long time period (and have enough disk space).
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To compute using this ephemeris in Python, see the `jplephem
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<http://pypi.python.org/pypi/jplephem>`_ package.
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"""
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