Here is a list of all namespaces with brief descriptions:

[detail level 1234]

Nvulcan
Naero
Nexponential_atmosphere
Nussa1976
Ndetail
Nconstants
Nearth
Nwgs84
Natmosphere
Nphysics
Nsun
Nmoon
Nangle
Ntime
Nunits
Nvalidation
Ndynamics
Nenvironment
Neclipse
Nconstants
Nmagnetic
Nconstants
Nsolar
Nconstants
Nestimation
Ngeodetic
Ngeometry
Ngravity
Nj2
Nj2j4
Npoint_mass
Nspherical_harmonics
Nio
Ndetail
Nmass
Norbital
Nephemeris
Nanalytical
Nanomaly
Nquantities
Nelements
Ntransfer
Npropulsion	Propulsion utilities for rocket, air-breathing, and electric systems
Nair_breathing
Nelectric
Nrocket
Nrng
Ndetail
Nallan
Nbias_instability
Ngaussian
Nmarkov
Nsensors
Nimu_grades
Nrandom_walk
Ntime
Ntf	Transfer function utilities for linear systems and nonlinear elements
Nconstant_wind
Ndryden
Nvon_karman
Nwind_shear
Nroughness
Nexponent
Nwind
Ndetail
NYAML