celestial bodies rotational elements interface

Project.toml

@@ -1,7 +1,7 @@
 name = "JSMDInterfaces"
 uuid = "6b30ee2f-618e-4a15-bf4e-7df7b496e609"
 authors = ["JSMD Team"]
-version = "1.5.0"
+version = "1.6.0"
 
 [deps]
 Graphs = "86223c79-3864-5bf0-83f7-82e725a168b6"

src/Bodies.jl

@@ -0,0 +1,52 @@
+module Bodies 
+
+"""
+    body_rotational_elements(T, ::Val{id})
+
+Interface to compute the rotational elements of a body with ID `id`.
+Rotational elements includes `α`, `δ` and `W` that identifies the north pole 
+of the body and its prime meridian.
+
+The north pole is that pole of rotation that lies on the north side of the 
+invariable plane of the solar system. Its direction is specified by the values 
+of its right ascension `α`, declination `δ` .
+
+The location of the prime meridian is then given by `W`, which is a rotation 
+in the body equator of date. 
+"""
+function body_rotational_elements end
+function ∂body_rotational_elements end
+function ∂²body_rotational_elements end
+function ∂³body_rotational_elements end
+
+"""
+    body_pole(T, ::Val{id})
+
+Interface to compute the north pole direction of the `id` body.
+"""
+function body_pole end 
+
+"""
+    body_right_ascension(T, ::Val{id})
+
+Interface to compute the right ascension of the north pole of a 
+body identified by `id`.
+"""
+function body_right_ascension end 
+
+"""
+    body_declination(T, ::Val{id})
+
+Interface to compute the declination of the north pole of a 
+body identified by `id`.
+"""
+function body_declination end 
+
+"""
+    body_prime_meridian(T, ::Val{id})
+
+Interface to compute the prime meridian angle of a body identified by `id`.
+"""
+function body_prime_meridian end 
+
+end

src/JSMDInterfaces.jl

@@ -9,5 +9,6 @@ include("Frames.jl")
 include("Math.jl")
 include("Ephemeris.jl")
 include("Models.jl")
+include("Bodies.jl")
 
 end