PAN Resets the amount by which cursor keys pan the screen. You can set the pan amount to be in angular units, or a percentage of the CCD frame size. Described in full at http://www.projectpluto.com/update8c.htm#pan_xtrol MAX_DSS_DOWNLOAD Sets maximum dimensions, in arcminutes, for a DSS image download. Default is 15 arcminutes. The only problem with raising this value is that if you've a wide enough field and download an image, it may be a very large download. MPCORB_PATH Resets path to the mpcorb.dat file. Useful if you have a copy of that file in some folder other than the Guide one. Described in full at http://www.projectpluto.com/mpcorb.htm#mpcorb_path SPIN_STEP Sets the angle, in degrees, by which the sky is rotated when the "Spin screen right" or "Spin screen left" toolbar buttons/hotkeys are used. Default is five degrees. ASTEROID_SYM Used to define the symbol used for asteroids. For details of how symbols are defined, see http://www.projectpluto.com/tdf_info.htm#custom_symbols . For example, setting ASTEROID_SYM=e0,0,32; would cause asteroids to be shown as small circles. ASTFILTER Allows one to show only asteroids of a given orbital type. Described at http://www.projectpluto.com/update7.htm#asteroid_filtering . UPPER_MAG_TEXT Shuts off the display of star magnitude labels _brighter_ than a particular limit. Useful if, say, you only want stars of magnitudes between 10.3 and 11.5 to be labelled by magnitude. Set in tenths of a magnitude. A negative value is assumed to be relative to the faint mag label limit set in the star display dialog; for example, if in that dialog, "Mag label limit" is set to 11.5, and you set UPPER_MAG_TEXT=-12, then only stars between mags 10.3 and 11.5 will be labelled by magnitude. A positive value is assumed to be "fixed"; for example, UPPER_MAG_TEXT=98 would cause no star brighter than mag 9.8 to be labelled by magnitude. CITY_SYM CAPITAL_SYM Used to reset the symbol used when drawing cities and capital cities in eclipse/occultation mode. See http://www.projectpluto.com/tdf_info.htm#custom_symbols for details on how symbols are defined. GSC_BRIGHT_LIMIT When GSC stars are shown (the default in Guides 1.0 through 8.0 and an option in Guide 9.0), GSC stars brighter than mag 7.0 are assumed to be provided from Tycho/Hipparcos data, and therefore not shown. This suppresses a lot of spurious GSC stars. GSC_BRIGHT_LIMIT lets you reset this limit, in tenths of magnitudes; e.g., GSC_BRIGHT_LIMIT=94 would cause all GSC stars brighter than 9.4 to be suppressed. (Also, GSC stars appearing in Tycho/Hipparcos will automatically be suppressed, to avoid fake "double stars".) MIN_IMG_SIZE Sets the size a background (DSS or RealSky) image must be, in pixels, to be shown on screen. Defaults to 40. Setting this smaller will allow DSO images to appear at wider fields. Be warned, though, that if you set this too small, Guide will attempt to draw swarms of tiny images in DSO-rich fields, and the program will slow to a crawl. A2_PATH SA2_PATH A1_PATH SA1_PATH Resets the path to USNO-A2.0 (or SA2.0, or A1.0, or SA1.0) files. Described in full at http://www.projectpluto.com/update7.htm#ax0_direct . UCAC2_PATH UCAC3_PATH Resets the path where Guide will look for UCAC-2 and UCAC-3 data. See http://www.projectpluto.htm/update8c.htm#ucac2_display and http://www.projectpluto.htm/update8e.htm#ucac3_hd_dvd for details. B1_PATH Resets the path where Guide will look for USNO B1.0 data. See http://www.projectpluto.htm/update8d.htm#b1_from_hard_drive for details. SCOPE_SYM Resets the symbol used for the on-screen scope indicator (the default is a red circle with four lines around it). SCOPE_MARGIN By default, when the scope indicator is within 10% of a screen width of the edge of the chart, Guide recenters on the scope indicator (instead of just redrawing it). This corresponds to SCOPE_MARGIN=.1. SCOPE_MARGIN=.5 would correspond to insisting that the scope indicator be at the exact center of the screen at all times; i.e., any scope movement would cause the screen to refresh. Don't do this unless you have a fast system. GUIDER_CHIP Used to describe the placement of SBIG-style CCD guider chips. For most known systems, you won't need this; you can just select your camera in the CCD Frame dialog, and Guide will put the guiding chip where it ought to go. For details (in the unlikely case that you still need or want to know), see the comments at the bottom of 'ccds.nam' in your Guide folder. GROUND_DRAWING By default, if the ground and horizon objects are turned on in the Display... Backgrounds dialog, the sky is drawn on top of them, as if the ground/horizon objects were transparent. This is very convenient, but obviously not a good approximation to reality. Set GROUND_DRAWING=2 , and the ground and horizon objects will be opaque. MAG_LABEL_PREC (Applies only to Tycho/Hipparcos stars) Set MAG_LABEL_PREC=100 to get magnitude labels given to .01-mag precision. SKIP_TYCHO Set SKIP_TYCHO=y to cause all Tycho/Hipparcos stars (i.e., all bright stars) to not display. DRAWVAR.CPP(258) : else if( !*(symbol_to_draw = get_environment_ptr( "PLANET_NEB_SYM"))) DRAWVAR.CPP(277) : else if( !*(symbol_to_draw = get_environment_ptr( "GALAXY_CLUS_SYM"))) DRAWVAR.CPP(294) : else if( !*(symbol_to_draw = get_environment_ptr( DRAWVAR.CPP(306) : else if( !*(symbol_to_draw = get_environment_ptr( DRAWVAR.CPP(327) : else if( !*(symbol_to_draw = get_environment_ptr( "GLOB_CLUS_SYM"))) DRAWVAR.CPP(334) : else if( !*(symbol_to_draw = get_environment_ptr( "GALAXY_SYM"))) GRABTEXT.CPP(209) : const char *debug_filename = get_environment_ptr( "DEBUG_FILENAME"); LEGEND.CPP(336) : if( chart->fixed_levels || *get_environment_ptr( "LEGEND_LEVELS")) LEGEND.CPP(477) : (DINFO->in_printing || !*get_environment_ptr( "TZ_COMBO")); LEGEND.CPP(738) : const char *legend_override = get_environment_ptr( "OBJECT_KEY"); MARKINGS.CPP(466) : user_horizon = atof( get_environment_ptr( "USER_HORIZON")) * PI / 180.; MARKINGS.CPP(849) : if( *get_environment_ptr( "SIDE_LABELS")) MARKINGS.CPP(1424) : horiz_filename = get_environment_ptr( buff); MARKINGS.CPP(1430) : obj_filename = get_environment_ptr( buff); MISCELL.CPP(338) : running_under_wine = (*get_environment_ptr( "WINE") ? 1 : 0); MISCELL.CPP(1814) : t0 += atof( get_environment_ptr( "TOFFSET")) * 3600.; MISCELL.CPP(2986) : if( *get_environment_ptr( "IS_AP")) /* Astro-Physics scopes use an */ MISCELL.CPP(2999) : const char *forced_format = get_environment_ptr( "FORCED_LX200"); OVLFUNCS.CPP(460) : const char *precise_override = get_environment_ptr( "EPHEM_PREC"); OVLFUNCS.CPP(462) : double multiplier = (180. / PI) * atof( get_environment_ptr( "SPEED_MULT")); OVLFUNCS.CPP(561) : if( *get_environment_ptr( "MAG_PREC")) PLANETS.CPP(538) : jpl_eph_filename = get_environment_ptr( "JPL_EPH"); PLANETS.CPP(923) : use_light_time = get_environment_ptr( "USE_LIGHT_TIME"); PLANETS.CPP(2163) : const char *use_matrix_dither = get_environment_ptr( "MATRIX_DITHER"); PLANETS.CPP(3383) : interpolation_on = (pmap.width < 3 * desired_width && !*get_environment_ptr( "NO_INTERP")); PLANETS.CPP(3870) : const char *min_planet_size_str = get_environment_ptr( "MIN_PLANET_SIZE"); PLANETS.CPP(3954) : if( *get_environment_ptr( "OPAQUE_PLANETS")) PLANETS.CPP(4027) : const char *planet_sym = get_environment_ptr( "PLANET_SYM"); REDRAW.CPP(130) : if( *get_environment_ptr( "BRIGHT_LIMIT")) REMARKS.CPP(1011) : if( *get_environment_ptr( "NUT_TEST")) REMARKS.CPP(1370) : strcpy( buff, get_environment_ptr( "NGCIC_PATH")); REMARKS4.CPP(482) : double prec_override = atof( get_environment_ptr( "PLANET_PREC")); REMARKS4.CPP(484) : if( *get_environment_ptr( "SHOW_STATE")) /* miscell.c */ REMARKS4.CPP(685) : const char *mpc_path = get_environment_ptr( "MPCORB_PATH"); REMARKS4.CPP(1984) : const char *eptr = get_environment_ptr( "PHOTOMETRY"); SCOPE.CPP(67) : strcpy( resolution_command, get_environment_ptr( "RESOLUTION_COMMAND")); SCOPE.CPP(131) : const char *modem_init_str = get_environment_ptr( "MODEM_INIT"); SHOWPICK.CPP(218) : const char *output_filename = get_environment_ptr( "PICK_FILE"); SHOWPICK.CPP(952) : int time_format = atoi( get_environment_ptr( "RISE_SET_FORMAT"));