diff --git a/GUI/xephem/help/xephem.html b/GUI/xephem/help/xephem.html
index d9311c4..54ae730 100644
--- a/GUI/xephem/help/xephem.html
+++ b/GUI/xephem/help/xephem.html
@@ -8102,39 +8102,36 @@ ideal companion and is automatically chosen as a convenience.
Root directory
This choice of field stars supports the SA and the A series of
-astrometric catalogs produced in recent years by the US Naval
-Observatory. The SA2.0 for example, includes some 54 million stars,
+astrometric catalogs produced by the US Naval Observatory. The SA2.0
+for example, includes some 54 million stars, about a tenth of the parent A2.0,
spatially sampled so there is about 1,300 stars per square degree of
sky. Note that such a uniform distribution does not "look" much like
the real sky, but it is great for its intended use as an astrometric
-mesh for comet hunters or such. To order these catalogs, see
http://psyche.usno.navy.mil/pmm.
-If you have such a catalog, simply enter the name of its base directory
-and toggle this switch on. The default assumes a symbolic link,
-"catalogs/usno" off the shared directory. The suggested citation for
-SA1.0 follows:
+mesh for comet hunters or such. If you have such a catalog, simply
+enter the name of its base directory and toggle this switch on.
+The default assumes a symbolic link, "catalogs/usno" off the shared
+directory. Multiple versions of the catalogs can be stored, each in
+its own directory, but only one may be active at a time.
+
+The suggested citation for SA2.0 follows:
Monet, D., Bird, A., Canzian, B.,
-Harris, H., Reid, N., Rhodes, A., Sell, S., Ables, H., Dahn, C.,
-Guetter, H., Henden, A., Leggett, S., Levison, H., Luginbuhl, C.,
-Martini, J., Monet, A., Pier, J., Riepe, B., Stone, R., Vrba, F.,
-Walker, R. 1996, USNO-SA1.0, (U.S. Naval Observatory, Washington
-DC).
+Dahn, C., Guetter, H., Harris, H., Henden, A., Levine, S., Luginbuhl, C.,
+Monet, A., Rhodes, A., Riepe, B., Sell, S., Stone, R., Vrba, F., Walker, R.,
+1998, USNO-SA2.0, (U.S. Naval Observatory, Washington DC).
This catalog has been included with permission of USNO as long as
we mention the following stipulations:
It may not be the latest version,
-check
-with http://ad.usno.navy.mil.
+check with http://www.usno.navy.mil.
If you paid for XEphem, you paid for
the software, not this catalog. The catalog is available free from
the USNO.
Inclusion of the SA2.0 catalog does
-not
-imply an endorsement of XEphem by USNO; nor did I have privileged
+not imply an endorsement of XEphem by USNO; nor was there privileged
access to the catalog; nor does the US Government affirm or
guarantee that XEphem works properly in any way.
diff --git a/Site/help/xephem.html b/Site/help/xephem.html
index d9311c4..54ae730 100644
--- a/Site/help/xephem.html
+++ b/Site/help/xephem.html
@@ -8102,39 +8102,36 @@ ideal companion and is automatically chosen as a convenience.
Root directory
This choice of field stars supports the SA and the A series of
-astrometric catalogs produced in recent years by the US Naval
-Observatory. The SA2.0 for example, includes some 54 million stars,
+astrometric catalogs produced by the US Naval Observatory. The SA2.0
+for example, includes some 54 million stars, about a tenth of the parent A2.0,
spatially sampled so there is about 1,300 stars per square degree of
sky. Note that such a uniform distribution does not "look" much like
the real sky, but it is great for its intended use as an astrometric
-mesh for comet hunters or such. To order these catalogs, see
http://psyche.usno.navy.mil/pmm.
-If you have such a catalog, simply enter the name of its base directory
-and toggle this switch on. The default assumes a symbolic link,
-"catalogs/usno" off the shared directory. The suggested citation for
-SA1.0 follows:
+mesh for comet hunters or such. If you have such a catalog, simply
+enter the name of its base directory and toggle this switch on.
+The default assumes a symbolic link, "catalogs/usno" off the shared
+directory. Multiple versions of the catalogs can be stored, each in
+its own directory, but only one may be active at a time.
+
+The suggested citation for SA2.0 follows:
Monet, D., Bird, A., Canzian, B.,
-Harris, H., Reid, N., Rhodes, A., Sell, S., Ables, H., Dahn, C.,
-Guetter, H., Henden, A., Leggett, S., Levison, H., Luginbuhl, C.,
-Martini, J., Monet, A., Pier, J., Riepe, B., Stone, R., Vrba, F.,
-Walker, R. 1996, USNO-SA1.0, (U.S. Naval Observatory, Washington
-DC).
+Dahn, C., Guetter, H., Harris, H., Henden, A., Levine, S., Luginbuhl, C.,
+Monet, A., Rhodes, A., Riepe, B., Sell, S., Stone, R., Vrba, F., Walker, R.,
+1998, USNO-SA2.0, (U.S. Naval Observatory, Washington DC).
This catalog has been included with permission of USNO as long as
we mention the following stipulations:
It may not be the latest version,
-check
-with http://ad.usno.navy.mil.
+check with http://www.usno.navy.mil.
If you paid for XEphem, you paid for
the software, not this catalog. The catalog is available free from
the USNO.
Inclusion of the SA2.0 catalog does
-not
-imply an endorsement of XEphem by USNO; nor did I have privileged
+not imply an endorsement of XEphem by USNO; nor was there privileged
access to the catalog; nor does the US Government affirm or
guarantee that XEphem works properly in any way.