while doing whole-tree work on python things, I noticed that astro is missing a few things that could be useful in conjunction with py-astropy. here's a port for https://rhodesmill.org/skyfield/ and a small chain of required ports. ok to import?
==> astro/py-skyfield/pkg/DESCR <== Skyfield computes positions for the stars, planets, and satellites in orbit around the Earth. Its results should agree with the positions generated by the United States Naval Observatory and their Astronomical Almanac to within 0.0005 arcseconds (half a "mas" or milliarcsecond). Skyfield can compute geocentric coordinates or topocentric coordinates specific to your location on the Earth's surface. While Skyfield itself has no dependency on the AstroPy library, it's willing to accept AstroPy time objects as input and return results in native AstroPy units. ==> astro/py-sgp4/pkg/DESCR <== This Python package computes the position and velocity of an earth-orbiting satellite, given the satellite's TLE orbital elements from a source like https://celestrak.com/. It implements the most recent version of SGP4, and is regularly run against the SGP4 test suite to make sure that its satellite position predictions agree to within 0.1 mm with the predictions of the standard distribution of the algorithm. This error is far less than the 1-3km/day by which satellites themselves deviate from the ideal orbits described in TLE files. ==> astro/py-de421/pkg/DESCR <== This is a recent short-period ephemeris published by the Jet Propulsion Laboratory. It requires only 27 MB of storage and is specially accurate with respect to the position of Earth's Moon. ==> astro/py-jplephem/pkg/DESCR <== This package can load and use a Jet Propulsion Laboratory (JPL) ephemeris for predicting the position and velocity of a planet or other Solar System body. Note that jplephem offers only the logic necessary to produce plain three-dimensional vectors. Most programmers interested in astronomy will want to look at Skyfield instead, which uses jplephem but converts the numbers into more traditional measurements like right ascension and declination. Most users will use jplephem with the Satellite Planet Kernel (SPK) files that the NAIF facility at NASA JPL offers for use with their own SPICE toolkit. They have collected their most useful kernels beneath the directory: http://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/
astro-py-ports.tgz
Description: application/tar-gz
