Ganymede is the largest of the four large satellites
of Jupiter found by Galileo.  It has an extremely rugged
surface,  crossed by folded rills of uncertain origin.

General Catalog of Variable Stars 
   Most of the data on variable stars in Guide comes from
the General Catalog of Variable Stars,  or GCVS,  a list
of data for over 28,000 variables.  Over 2,200 additional
variables (those found after the GCVS's creation in 1982)
were provided from an AAVSO list.

   Geocentric means "using the Earth as the center".  Its
most common use was in the theory that the Earth is the
center of the universe,  with the Sun and other objects
revolving around it.
   In this program,  the term has a more specific use.  A
particular datum is "geocentric" if it is measured from the
center of the Earth.  A topocentric datum is measured from
the surface of the Earth,  and a heliocentric one is
measured from the center of the Sun.

Get Ax.0 data 
   If you have the ten-CD set of USNO A1.0 disks,  or the
eleven-CD set of A2.0 disks,  or the single-CD SA1.0 or
SA2.0 disk,  you can extract data from them and display it
in Guide.  The process is quite similar to the one used for
RealSky images.
   To extract Ax.0 or SAx.0 data,  center the chart on the
object of interest, and click on the Get Ax.0 data in the
Extras menu.  Guide will ask for the size of the area to
extract,  in arcminutes;  and will provide check-boxes to
distinguish between A1.0/SA1.0 and A2.0/SA2.0.  You'll also
get a list of which CDs are needed.  (Usually,  only one will
be needed.  But the area you want may be on the border between
two disks.)
   Swap in the disk Guide asked for (or the SAx.0 disk),  and
Guide will extract the data from it.
   In DOS,  you can also access this option with the
Shift-F11 hotkey.

Getting a list of hotkeys 
   You can get a list of all the hotkeys that Guide
understands at any point in the program by hitting the
'?' key.

globular cluster 
   Scattered around the rim of our own galaxy and around
most others are globular clusters:  round balls of
thousands to millions of densely packed stars.  A good
example is M-13 (Messier 13) in the constellation
Hercules;  you can recenter on it using the Go to Messier
option under the Go To menu.  You'll have to zoom in
pretty far before you see the individual stars in the
cluster.  To the unaided eye, M-13 is a faint, fuzzy
patch,  but it contains many thousands of stars.
   Most globulars have either a Messier or NGC number.
You can find others,  such as Omega Centauri,  47 Tucanae,
and the Palomar and Terzan objects,  in the Globular
Cluster dialog under the Go To menu.
   Globular clusters are shown as a circle with a cross
inside followed by a Messier,  NGC or IC number.
   Globular clusters are very different from open
clusters.  They contain many more stars,  are farther
away (usually thousands of light-years away),  and have
some of the oldest stars in the galaxy in them.

page 1 
3K background             a sin i                   A1.0
A2.0                      AAVSO                     Abell
aberration                absolute magnitude        accretion disk
ACT catalog               Add a Trail               Add DSS image
Add to Print Queue        ADS                       AGK
Albedo                    Algol-type                Alpha CVn
Alpha Cyg                 altitude                  AM Her
Amor                      angstrom                  angular diameter
Animation                 aperture circle           aphelion
apogee                    Apollo                    apparent magnitude
AR Lac                    arcminute                 arcsecond
argument of perihelion    artifact                  Asteroid diameter
asteroid                  astrometric binary        astrometry
Astronomical twilight     astronomical unit         Aten
AU                        autumnal equinox          azimuth
B magnitude               B-V                       B1950
Background Dialog         Balmer                    Barnard
Bayer                     BD                        Be star
Besselian epoch           Beta Cep                  Beta Lyrae
binary                    BL Her                    BL Lac
black hole                blended object            Bright Star
Bright Star               BT magnitude              BY Draconis
Callisto                  Caption on/off            carbon star
cataclysmic variable      CCD frame                 CD
celestial equator         Centaur                   central meridian
Cepheid variable          CGCG                      chart area
Chart mode                Chinese calendar          circumpolar
Civil twilight            cluster of galaxies       cluster
colongitude               Colors Menu               comet
common proper motion      constellation borders     constellation labels
constellation lines       constellation             contact binary
COPERNICUS                corrector                 CP
CPD                       CPM                       dark nebula
Data Shown                declination               degree
Delete a Mark             Delta Cep                 Delta Sct
Delta-T                   diffuse nebula            display menu
DM                        Doppler effect            double star
DSS                       Durchmusterung            Dynamic Parallax
Dynamical Time            Eccentricity              eclipsing binary
Ecliptic coordinates      Ecliptic                  elliptical variable
elongation                emission line             emission nebula
emulsion                  Ephemeris Items           Ephemeris Time
ephemeris                 epoch of elements         epoch
Equation of time          equatorial radius         equidistant
Escape velocity           ESO/Uppsala               ESO
ET                        Europa                    Exposure start
Extras menu               "Fast" nova               Field rotation rate
File Menu                 Filter                    Find Conjunction
First quarter             FK Com                    FK5
Flamsteed                 flare                     Flattening
Fluctuating X-ray         Flush Print Queue         FOKAT-S
FU Orionis                Full moon                 full screen
Fundamental Katalog 5                                 galactic coordinate
galactic standard of rest                             galaxy
Gamma Cas                 gamma ray                 Ganymede
GCVS                      General Catalog of Variable Stars
geocentric                globular cluster          gnomonic
Go to City                Go to Country             Go to Mark
Go To menu                Go to planet feature      Great Red Spot
Greek letter              Greenwich Sidereal Time   Gregorian
grids                     Group Membership          GRS
GSC identifier            GSC                       GSR
GST                       Guide Star Catalog        GUIDE
H alpha                   H beta                    hatches
HD                        Hebrew calendar           heliocentric
Henry Draper              Hickson                   High-Precision Subset
Hilda                     HIP                       Hipparcos
home planet dialog        HPS                       HR
HR                        Hubble class              IC
inclination of orbit      Index Catalog             index marks
infrared                  intercalary month         interferometry
Inversion dialog          Io                        IRAS
irregular variable        Islamic calendar          isophotes
IUE                                                   J2000
Jalali (Persian) calendar                             jansky
JD                        Jet                       Johnson
Julian calendar           Julian Day                Julian epoch
Jupiter                   Keyzer                    kilometer
kiloparsec                km                        Kuiper belt
La Caille                 Language menu             Last quarter
latitude                  LBN                       LDN
LEDA                      legend dialog             Level Size
Libration                 light curve               light-year
limb angle                Line of variation         Local Events only
Local Group               Local Sidereal Time       Location dialog
Long period variable      long. ascending node      longitude
LPV                       LST                       luminosity class
luminosity                Luna                      lunisolar
LX-200                    Lyman                     Lynd's Bright
Lynd's Dark               m sin3i                   Magellanic Cloud
magnetic variation        magnitude                 Main Menu
main sequence             Make .BMP File            Make Ephemeris
Margins menu              Markarian                 Mars
MCG                       mean anomaly              mean solar day
measurements dialog                                   Mercury
Merged Catalog of Galaxies                            meridian
Messier                   meteor shower             meteor
meter                     MHD                       microwave
Minor Planet Center       Minor Planet Circular     Mira type
MK                        Morphological Catalog of Galaxies
MPC                       Mu Cep                    nadir
nanometer                 Nautical twilight         Nearby star
Nebula Databank           nebula                    Neptune
neutral hydrogen                                      neutron star
New Catalog of Suspected Variables                    New moon
NGC2000                   NGC                       non-star
nova                      NSV                       nutation
Object Pick dialog        obliquity to orbit        occultation double
open cluster              opposition point          orbital elements
Orion type                orthographic              Overlay menu
Overlay Pick dialog       Palomar Observatory Sky Survey
parallax                  parity                    parsec
Partial Events            penumbra                  Perek-Kohoutek
periastron                perigee                   perihelion
PGC                       photographic magnitude    PK
planet                    planetary nebula          plate
Pluto                     polar radius              Polarization
Position angle            POSS                      PPM
precession                                            Preliminary designation
Principal Galaxy Catalog                              Printer setup
prograde                  Project Pluto             Projection menu
prominence                proper motion             pulsar
PV Tel                    Quasar                    Quick Info
R CrB                     RA/dec format             radial velocity
radiant                   Rapid irregular           RASNZ
RC3                       "Real slow" nova          RealSky image
redshift                  Reflecting binary         reflection nebula
refraction                repeating nova            Republican calendar
retrograde                right ascension           rise/set times
rotation period           rotational velocity       RR CrB
RR Lyrae                  RS CVn                    RV Tauri
S Dor                     SA1.0                     SAC
SAO                       Saturn                    Save a Mark
Schmidt                   Scope Pad                 SD
Select Printer            selenographic             Semimajor axis
Semiregular long-period   separation                Set Location
Settings menu             Sharpless                 Show Eclipse
side labels               Sidereal Time             sidereal
Sky Commander             slope parameter           Slow irregular
"Slow" nova               solar constant            Solar rotation number
solstice                  speckle interferometry    spectral type
Spectroscopic Binaries    spectrum                  SS Cyg
stereographic             SU UMa                    summer solstice
Sun                       supernova                 supplemental plate
SX Arietis                SX Her                    SX Phe
Synchronous rotation      T Tauri                   Tables menu
TD                        Telrad                    terminator
Third Reference Catalog   ticks                     tides
time zone dialog          Titan                     TLE
Toolbar Dialog            topocentric               totality
transit time              transition variable       trigonometric parallax
Trojan                    Twilight                  Tycho Input Catalog
Tycho                     Type I supernova          Type II supernova
U Gem                     UGC                       Ultraviolet FeII
ultraviolet               umbra                     Universal Time
Uppsala General Catalog   Uranus                    user added dataset
user object dialog        USNO                      UT
UV Ceti                   UV                        v sin i
V-I                       van den Bergh             variable
Venus                     vernal equinox            Virgo infall
visible light             Visual magnitude limit    visual magnitude
VT magnitude              W Vir                     Washington Double Star
wavelength                WDS                       white dwarf
winter solstice           Wolf-Rayet                X-ray burster
X-ray irregular           X-ray jet variable        X-ray novalike
X-ray reflector           X-ray variable            X-ray
Yale                      YY Ori                    Z Andromedae
Z Aqr                     Z Cam                     zenith
zodiac                    zoom level                Zwicky
ZZ Ceti

Atlas of Galactic Nebulae 
The "Atlas of Galactic Nebulae" includes 1547 nebulae that appear
on the POSS or the ESO/SRC Atlas. The "Atlas of Galactic Nebulae"
shows positions,  sizes,  and images of all included nebulae.  It
was one of the most important sources for the Nebula Databank.
Reference: Neckel, Th., Vehrenberg, H. 1985: Atlas Galaktischer
Nebel Teil I to III.

Go to .TDF object 
   The Go to .TDF object option,  inside the Go To menu,
is used if you want to find an object in one of the user added
datasets.  When you click on this option,  Guide will show
all of the currently available user added datasets (as well
as a few that are supplied with the program).  Click on one,
and enter an object identifier from that catalog,  and Guide
will recenter on that object.

Go to Abell cluster 

   This option is used when you want to recenter on a
cluster of galaxies by typing in its Abell catalog
   When you select this option,  you are asked for an
Abell catalog number.  If you enter one,  you will
recenter on that object.  You can also hit escape at that
point to cancel.

Go to Abell planetary 
   This option is used when you want to recenter on a
planetary nebula by typing in its Abell catalog number.
   Abell planetaries are mostly dim,  "challenge" objects.
   When you select this option,  you are asked for an
Abell catalog number (from 1 to 86).  If you enter one,
you will recenter on that object.  You can also hit
escape to cancel.
   This catalog shouldn't be confused with the Abell catalog
of clusters of galaxies.

Go to Arp 
   This option is used when you want to recenter on a
galaxy by typing in its Arp catalog number.
   When you select this option,  you are asked for an
Arp number.  If you enter one,  you will recenter on
that object.  You can also hit escape at that point to

Go to Asteroid 

   This option lets you type in the name or number of an
asteroid that you wish to recenter on.
   You can enter the asteroid's number (for example,  "1"
for the asteroid Ceres),  its name (such as Vesta,  Juno,
or Mr. Spock),  or its preliminary designation (usually
a year followed by one or two letters,  given an asteroid
until its orbit has been well-determined.)
   You can reach this option at any point in Guide by
hitting the semicolon (;) hotkey.

Go to Barnard 

   This option is used when you want to recenter on a
dark nebula by typing in its Barnard catalog number.
   When you select this option,  you are asked for a
Barnard catalog number.  If you enter one,  you will
recenter on that object.  You can also hit escape at that
point to cancel.

Go to Bayer/Flamsteed 
   This option is used to find a star by its Bayer or
Flamsteed designation,  and recenter on it.
   When you select this option,  you will first be shown a
menu of the 88 constellation abbreviations.  You pick a
constellation,  at which point you will be shown a list of
all the Bayer and Flamsteed stars for that constellation.
If you pick one of these,  you will recenter on that
object.  You can hit escape at any point to cancel.
   You can also find a Bayer or Flamsteed star using the
Ctrl-B option.  This method does not rely on menus,  and
can be helpful to those who prefer not to use a mouse.

Go to CGCG 

   This option is used when you want to recenter on a
galaxy by typing in its CGCG (Catalog of Galaxies and
Clusters of Galaxies) number.
   When you select this option,  you are asked for a CGCG
catalog number.  If you enter one,  you will recenter on
that object.  You can also hit escape at that point to
   A CGCG designation consists of two numbers,  separated
by either a space or a minus (-) sign.  Sometimes a letter
is added.

Go to Common Star Name 

   When you select this option,  you will see a list of
about 200 common names for bright stars,  such as Rigel,
Deneb,  and Betelgeuse.  If you pick one of these names,
you will recenter on that star.

Go to Constellation 

   This option shows a menu of the 88 officially
recognized constellations.  Click on one,  and you will
be recentered on that constellation.
   You can also reach this menu with the > hotkey,  or
by clicking on the constellation shown in the menu.

Go to coordinate 
coordinates menu 
   The Go to coordinate submenu,  inside the Go To menu,
provides four different ways to find a point in the sky by
entering coordinates:

   Enter RA/Dec
   Enter ecliptic coordinates
   Enter galactic coordinates
   Enter altitude/azimuth
   Find opposition point

   In DOS,  you can reach this menu with the Alt-[ hotkey.

Go to Country 
Go to City 
   If you have used the show eclipse option to display an eclipse,
transit,  or occultation chart in Guide,  the Go To menu will list
the options Go to Country and Go to City.
   "Go to Country" will bring up a list of 173 nations.  Click on one,
and Guide will recenter the chart on that nation.
   A similar list of all cities would be huge,  so Guide only will list
those cities in the current chart area.  If you wanted to find Sydney,
for example,  you would have to first zoom in on Australia,  and only
then use the "Go to City" option.  Click on "Sydney",  and Guide would
recenter on that point.
   The world-wide chart shown by Guide is always centered on latitude
0,  longitude 0,  and these "Go To" options are grayed out when that
chart is being displayed.

Go to Double Star 
   This option is used when you want to recenter on a star
by typing in its double star designation.
   When you select this option,  a menu appears of over
130 double star catalogs,  such as the ADS (Aitken Double
Star) and both Struve catalogs.  Click on the desired
catalog,  and you will be asked to type in the number of
the star you want.  Guide will then recenter on that

Go to Durchmusterung 

   This option lets you find stars in the DM (Durchmusterung)
catalog.  You do have to specify which of the four sections
of the DM you wish to use:  the BD (Bonner Durchmusterung;
covers stars from about -1 declination to +89);  the SD
(Sudentliche Durchmusterung;  from -1 to -23);  the CD
(Cordoba Durchmusterung;  from -22 to -89);  or the CPD
(Cape Photographic Durchmusterung;  from -18 to -89).