diff --git a/GUI/xephem/help/xephem.html b/GUI/xephem/help/xephem.html
index 574d346..ec5b04d 100644
--- a/GUI/xephem/help/xephem.html
+++ b/GUI/xephem/help/xephem.html
@@ -716,7 +716,7 @@ substituted. If you figure
out how to configure for another browser or you know of a better
definition please send us your results and we will post on our web site.
-Note the entry for using IE under cygwin. In order for this to work,
you must create an
environment variable before running XEphem named XEHELPURL set to the
@@ -1082,7 +1082,7 @@ field varies from true north. Put another way,true az = magnetic
bearing - mag decl. The model is stored in the file wmm.cof in the
auxil directory of the shared directory. It is valid for 2000
through the end of 2004. Check http://www.ngdc.noaa.gov/seg/potfld/DoDWMM.shtml
+ href="https://www.ncei.noaa.gov/products/world-magnetic-model" target="new">https://www.ncei.noaa.gov/products/world-magnetic-model
for updates.
@@ -1896,14 +1896,14 @@ hspace="10" width="266">This
window provides a convenient tool to download, display and manage
images
from SOHO, the Solar
+href="https://sohowww.nascom.nasa.gov/">Solar
& Heliospheric Observatory. Use of this
extraordinary data is courtesy of the SOHO consortium. SOHO is a
project
of international cooperation between ESA and NASA.
The SOHO data is pulled from the web site
-http://sohowww.nascom.nasa.gov. The host name is defined in the XEphem
+https://sohowww.nascom.nasa.gov. The host name is defined in the XEphem
resource XEphem.SOHOhost. This may be changed if necessary by placing a
new value in the XEphem resource file.
@@ -2195,8 +2195,8 @@ surface but would rather not change the XEphem date to a full Moon.
This value depends on the gamma of your display. A fine discussion
of display gamma and a test image with which you can determine the
gamma value of your own display may be found at the URL: http://web.mit.edu/jmorzins/www/gamma/rwb/gamma.html.
+ href="https://web.mit.edu/jmorzins/www/gamma/rwb/gamma.html"
+ target="new">https://web.mit.edu/jmorzins/www/gamma/rwb/gamma.html.
Movie Demo
@@ -2547,7 +2547,7 @@ height.
cloud imagery, ice, sea and land temperatures, courtesy Space
Science and Engineering Center at the University of Wisconsin. The
image is a gif file retrieved from http://www.ssec.wisc.edu/data/comp/latest_cmoll.gif.
+ href="https://www.ssec.wisc.edu/data/comp/latest_cmoll.gif" target="new">https://www.ssec.wisc.edu/data/comp/latest_cmoll.gif.
It is updated once every six hours. All other graphical features of
the Earth view remain available as overlays to this image. Primary
advantage is ease in determining whether weather will effect
@@ -5391,7 +5391,7 @@ protocol, any other instrumentation whatsoever. The control can be
performed via a simple fifo connection, or a much more flexible INDI
interface. For a complete description of the INDI protocol, please
download the reference specification from http://www.clearskyinstitute.com/INDI/INDI.pdf.
+ href="https://www.clearskyinstitute.com/INDI/INDI.pdf">https://www.clearskyinstitute.com/INDI/INDI.pdf.
Here we only describe the INDI configuration window, the INDI
control panel, testing the INDI system using the sample drivers, and
finally the simple fifo interface.
@@ -6325,13 +6325,12 @@ the frames directly as an actual movie because there are many such
formats and other tools available to collect the files into a movie in
your preferred format. For example, you could convert the PNG files
into GIF files using pngtopnm and ppmtogif tools
-from the netpbm
+from the netpbm
toolkit then make an
-animated gif using whirlgif
-or gifsicle.
+animated gif using
+gifsicle.
Another possibility is to use convert which is part of the
-ImageMagick
+ImageMagick
collection. Check your system before looking too far, these tools are
often
already installed on many UN*X systems.
@@ -7992,7 +7991,7 @@ format if it is not already.
Several particularly useful sites as of this build are already entered.
The first five are from Dr. TS Kelso's Earth satellite lists at celestrak.org. The other four are
+ href="https://www.celestrak.org">celestrak.org. The other four are
the Minor Planet Center's lists of hot comets and unusual asteroids
specially formatted for XEphem.
@@ -8000,10 +7999,14 @@ Click Get beside the desired
catalog to download the file to the Private directory and
simultaneously load into XEphem memory.
-Special files created by the Minor Planet Center
-and Lowell
-Observatory may also be downloaded. Each organization maintains
+Special files created by
+
+the Lowell
+Observatory may also be downloaded.
+Each organization maintains
extensive lists of all known asteroids and produces on a regular basis
Keplarian orbital elements precessed to the current date. Both are of
excellent quality. When the Get
@@ -8131,7 +8134,7 @@ This catalog has been included with permission of USNO as long as
we mention the following stipulations:
The Blue Marble project at http://earthobservatory.nasa.gov/Newsroom/BlueMarble -for their + href="https://visibleearth.nasa.gov/collection/1484/blue-marble">https://visibleearth.nasa.gov/collection/1484/blue-marblefor their wonderful whole-earth color images.
Corrections for ecliptic longitude from Adrian Robinson, adrianprobinson@yahoo.co.uk
The stellar spectra colors are based on work by Mitchell Charity, mcharity@lcs.mit.edu, at -http://www.vendian.org/mncharity/dir3/starcolor. +https://www.vendian.org/mncharity/dir3/starcolor.
Thanks to Paul Schlyter for some improved anomaly code.
The local magnetic declination model is from the DoD World Magnetic Model as published at http://www.ngdc.noaa.gov/seg/potfld/DoDWMM.shtml + href="https://www.ncei.noaa.gov/products/world-magnetic-model">https://www.ncei.noaa.gov/products/world-magnetic-model
Thanks to Fridger Schrempp, fridger.schrempp@desy.de, for his long term encouragement of the project, and particularly for many @@ -8950,7 +8952,7 @@ code, as converted from FORTRAN to C by Magnus Backstrom, b@eta.chalmers.se. See "Spacetrack Report Number 3: Models for Propagation of NORAD Element Sets" at http://www.celestrak.org/NORAD/documentation/spacetrk.pdf + href="https://www.celestrak.org/NORAD/documentation/spacetrk.pdf">https://www.celestrak.org/NORAD/documentation/spacetrk.pdf
Improvements to Delta T code, help and wording contributed by Neal McBurnett, nealmcb@bell-labs.com.
@@ -8975,13 +8977,13 @@ Laser Altimeter on board the Mars Global Surveyor, operated by the Jet Propulsion Laboratory, NASA. -See http://marsprogram.jpl.nasa.gov/mgs +See https://marsprogram.jpl.nasa.gov/mgsThe near real-time weather map in the Earth view is provided by the Space Science and Engineering Center at the University of Wisconsin. See their web site at http://www.ssec.wisc.edu/ssec.html + href="https://www.ssec.wisc.edu/data/">https://www.ssec.wisc.edu/data
The XEphem logo was contributed by Jonathan Adams, jfadams@mail.arc.nasa.gov. The galaxy background image is from Galaxy @@ -8989,7 +8991,7 @@ Photography, www.galaxyphoto.com.
For the years 1999-2010 the natural satellite ephemerides for Mars, Jupiter, Saturn and Uranus are based on developments in mixed functions computed and contributed at Bureau Des Longitudes, -http://www.bdl.fr +https://www.bdl.fr by J.-E. Arlot, Ch. Ruatti and W. Thuillot. Many thanks!
Outside this range, Jupiter's moons based on information in @@ -9059,7 +9061,7 @@ which grew into the new bitmap clipmask approach of drawing the stars.
Thanks to Jim Bell, jimbo@cuspif.tn.cornell.edu, and the team at Mars Watch for encourage, support and ideas for the first Mars albedo map in XEphem. The map as of Version 3.3 is from -http://maps.jpl.nasa.gov/mars.html +http://maps.jpl.nasa.gov/mars.html
Thanks to Dimitromanolakis Apostolos <apdim@grecian.net> for his contribution leading to support for fetching DSS in gzipped form.
@@ -9135,7 +9137,7 @@ Richard Talcott, published in _Astronomy_, October 1995, page 76.Thanks to Richard Clark (rclark@lpl.arizona.edu) for an improved version of anomaly.c.
A great source of comet information is http://encke.jpl.nasa.gov + href="https://science.nasa.gov/solar-system/comets/">https://science.nasa.gov/solar-system/comets/
Special thanks to Uwe Bonnes, bon@LTE.E-TECHNIK.uni-erlangen.de, and Ralphe Neill, ran@rdt.monash.edu.au, for their many ideas and @@ -9159,9 +9161,9 @@ the July 1993 issue of Sky and Telescope. Any errors in transcription are strictly my own.
Thanks to Lowell Observatory and the Minor Planet Center for maintaining their huge lists of asteroids. See -ftp://ftp.lowell.edu/pub/elgb/astorb.html +https://asteroid.lowell.edu/ and -http://cfa-www.harvard.edu/cfa/ps/mpc.html +https://cfa-www.harvard.edu/cfa/ps/mpc.html , respectively.
Thanks to the National Space Science Data Center and the Smithsonian Astrophysical Observatory for the SAO star catalogue.
@@ -9401,6 +9403,6 @@ program was named xephem. I have been diddling with it ever since. The original ephem is still available.