this package consists of only one function get_coords, that retrieves x , y , z coordinates of a given planet from NASA de440s.bsp file
planets are:
0 - SSB
1 - MERCURY_BARYCENTER
2 - VENUS_BARYCENTER
3 - EARTH_BARYCENTER
4 - MARS_BARYCENTER
5 - JUPITER_BARYCENTER
6 - SATURN_BARYCENTER
7 - URANUS_BARYCENTER
8 - NEPTUNE_BARYCENTER
9 - PLUTO_BARYCENTER
10 - SUN
11 - MOON
12 - EARTH
Time range is: from -4_734_072_000 seconds to 4_735_368_000 seconds