Hi guys!
I have just tagged the v0.5.0 of SatelliteToolbox.jl. This is a huge release (I think the biggest one of this package) that contains almost 2 months of work. Here is a summary of the changes (for a complete list, see the CHANGELOG.md):
 We now have a package documentation It is not complete yet and needs corrections, I did not have much time to review.

Huge performance increase in some functions:

legendre (conv)
: 40.6% faster. 
dlegendre (conv)
: 42.6% faster. 
rECEFtoECI (ITRF > GCRF)
: 99.5% faster. 
rECItoECEF (GCRF > ITRF)
: 99.5% faster. 
rECEFtoECEF (ITRF > PEF)
: 99.8% faster. 
rECItoECI (MOD > GCRF)
: 99.8% faster. 
GeodetictoECEF
: 71.6% faster. 
Two body orbit propagator
: 99.8% faster. 
J2 orbit propagator
: 99.8% faster. 
SGP4 orbit propagator
: 8.2% faster. 
compute_g (full EGM96)
: 18.3% faster. 
nrlmsise00
: 76.3% faster. 
igrf12 (geocentric)
: 11.2% faster. 
igrf12 (geodetic)
: 98.6% faster. 
sun_position_i
: 20.2% faster. 
angvel
: 59.3% faster. 
compute_ss_orbit_by_ang_vel
: 90.8% faster. 
list_ss_orbits_by_rep_period
: 79.4% faster.

 Three new atmospheric models: JacchiaRoberts 1971, JacchiaBowman 2008, and the exponential atmospheric model.
 A new system to automatically fetch the space indices. Hence, you can now call, for example, the NRLMSISE00 atmospheric model and the required indices (F10.7 and Ap) are automatically obtained.
 An algorithm to compute the Sun velocity vector w.r.t. an Earthcentered system is now available.