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Hi Cathal, Ok, now I can reproduce this. In fact, it is a "feature" that applies to the original image also. Here is a snippet of source: /* swap dark-bright color map. * this is used to keep

Oops - that's what I get for typing it out from memory and not verifying before reply.. Corrected URL: http://www.swibble.com/files/marsmap.jpg http://www.swibble.com/files/marsmap.jpg

Hi Cathal, Thanks for the update. This blurred version is perfect for visual observers. Your URL has a bug however, just change .files to /files. I tried the image and it works perfectly for me in

I've uploaded a copy to my website at http://www.swibble.com.files/marsmap.jpg http://www.swibble.com.files/marsmap.jpg as the link above appears to have succumbed to digital rot. I performed the same

I've never had trouble building Xephem on Gentoo, and I see in my 'world' file that I have x11-proto/printproto. "equery depends printproto" finds that x11-libs/libXp needed it. libXP is needed by a

bsharding@... [xephem] writes: [ ... ] On Debian, apt-file search X11/extensions/Print.h says: x11proto-print-dev: /usr/include/X11/extensions/Print.h So I had to install x11proto-print-dev.

Here is the last few lines of the build attempt. make[1]: Leaving directory '/home/bruce2/xephem-3.7.7/libz' gcc -I../../libastro -I../../libip -I../../liblilxml -I../../libjpegd -I../../libpng

One or both programs may be adjusting the positions to take account of many different effects. Precession is the largest one, but there's also nutation, aberration of starlight, parallax, the proper

OK, I changed the Equinox Epoch to 2015.2. It is closer, but still not on the money. Also, I understand that the Earth axis of rotation is processing (axis moving with respect to the galactic frame),

The Xephem RA/DEC matches the J2000 Astrometric RA/DEC in Cartes du Ciel. So does that mean Cartes du Ciel is extrapolating out the geocentric star positions and that is why they match the USNO data?

First guess would be an epoch mismatch. RA/Dec changes over time, so you need to be sure that xephem and Cartes du Ciel are telling you the RA/Dec at the same epoch and equinox. - Ernie

I am a little confused. I am under the impression that Xephem derives its AZ/EL data from RA/DEC and Earth position. Strangely, xephem disagrees with Cartes du Ciel on Polaris' RA/DEC, but agree

Hi This morning I tried to use GSC 2.3 field stars from STSCI for the first time in a while, and got an error about the connection being good but no data being found. After a bit of poking around it

Yes because I was checking the data with the transit by spirit leveling. And the Geoid would be best for that. However it was within a minute accuracy anyhow. I'm not completely sure of the azimuth

Karl, I'm not so sure I qualify as one of your "good folks" because my motivation is actually pretty selfish. You see, the first release of XEphem was in Dec 1990 and that, in turn, was based on

Hi Chris, The basic astronomical ephemeris engine used by most of XEphem uses the ellipsoid, but the satellite propagator uses the Geoid datum. No explicit attempt is made to reconcile the two where

actually an online diff of the makefiles 3.7.6 and 3.7.7 helped to point me in the correct direction. I should have diffed it on the box itself and it was probably the next step but it was nice to

What Earth model is used to generate a tangent plane for AZ/EL coordinates? Is it a Geoid datum, or an ellipsoid? Thanks, Chris Maness

Hi Karl, That is not my attitude at all and I do apologize for your inconvenience. However, I admit I made the decision to change from /usr to /opt in deference to the current directory arrangement on

on a recent compile on OSX PPC systems running 10.5.8 this code in the makefile messed things up for me CFLAGS = $(LIBINC) $(CLDFLAGS) -O2 -Wall -I$(MOTIFI) -I/opt/X11/include LDFLAGS = $(LIBLNK)