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@@ -293,7 +293,7 @@ <h3><a class="anchor" id="autotoc_md48"></a>
 <tr class="markdownTableRowOdd">
 <td class="markdownTableBodyNone">Fixed Earth System   </td><td class="markdownTableBodyNone">WGS84   </td><td class="markdownTableBodyNone">International Terrestrial Reference System (ITRS)   </td></tr>
 </table>
-<p>See the various enums and constants defined in <code><a class="el" href="novas_8h.html">novas.h</a></code>, as well as the descriptions on the various NOVAS routines on how they are appropriate for the old and new methodologies respectively. Figure 1 also shows the relation of the various old and new coordinate systems and the (Super)NOVAS functions for converting among them.</p>
+<p>See the various enums and constants defined in <code><a class="el" href="novas_8h.html">novas.h</a></code>, as well as the descriptions on the various NOVAS routines on how they are appropriate for the old and new methodologies respectively. Figure 1 also shows the relation of the various old and new coordinate systems and the (Super)NOVAS functions for converting position / velocity vectors among them.</p>
 <p>In NOVAS, the barycentric BCRS and the geocentric GCRS systems are effectively synonymous to ICRS, since the origin for positions and for velocities, in any reference system, is determined by the <code>observer</code> location, while aberration and gravitational deflection is included for apparent places only (as seen from the observer location).</p>
 <p>Older catalogs, such as B1950 (FK4) or B1900 are just special cases of MOD (mean-of-date) coordinates for the B1950 and B1900 epochs, respectively.</p>
 <p>TIRS (Terrestrial Intermediate Reference System) and its older equivalent PEF (Pseudo-Earth-Fixed) are not explicitly referenced in SuperNOVAS. But they can be thought of as a special case of ITRS (International Terrestrial Reference System) with DUT1 (= UT1-UTC), and the polar offsets (<em>dx</em>, <em>dy</em>) all set to zero.</p>

doc/README.md

@@ -378,7 +378,8 @@ terms differently:
  
 See the various enums and constants defined in `novas.h`, as well as the descriptions on the various NOVAS routines
 on how they are appropriate for the old and new methodologies respectively. Figure 1 also shows the relation of the
-various old and new coordinate systems and the (Super)NOVAS functions for converting among them.
+various old and new coordinate systems and the (Super)NOVAS functions for converting position / velocity vectors among 
+them.
 
 In NOVAS, the barycentric BCRS and the geocentric GCRS systems are effectively synonymous to ICRS, since the origin 
 for positions and for velocities, in any reference system, is determined by the `observer` location, while aberration