                                    The Sun

         Use  this  option to find,  for the date and time you  enter,  
         the   sun's   position  (right  ascension  and  declination),  
         altitude  and  azimuth,  nutation in longitude and obliquity,  
         times  of  sunrise  and  sunset,  and  times of beginning and 
         ending  of  morning  and  evening  astronomical twilight (the 
         time  when  the upper limb of the sun is 18 degrees below the 
         true horizon).

         Example entry format:

                         Month Day Year   Hrs Min Sec
                         1     1   1986   12  0   0



                                   The Moon

         Use  this  option  to find, for the date and time you  enter,
         the   moon's  position  (right  ascension  and  declination),  
         altitude   and   azimuth,   horizontal  parallax  (the  angle 
         subtended  by  the  earth  as  seen  from the moon), distance  
         from  the  earth,  semi-diameter,  illuminated  fraction, and 
         times of moonrise and moonset.

         Example entry format:

                         Month Day Year   Hrs Min Sec
                         1     1   1986   12  0   0




                                  The Planets

         Use  this  option  to  find,  for  the date, time, and planet
         you  enter,  the  position (right ascension and declination),    
         altitude  and  azimuth,  distance from the earth, elongation,   
         semi-diameter,  illuminated   fraction,  and  times of rising    
         and  setting  (in chronological order).  At this time, if you   
         enter "Pluto," ACE displays an error message.

         Example entry format:

                     Month Day Year   Hrs Min Sec   Planet
                     1     1   1986   0   0   0     Mars




                                   Eclipses

         Use this option to list, for the month or year you enter, the 
         circumstances  of  solar  and lunar eclipses visible from any
         location.  After  you  enter  a  month and year, you may list
         eclipses  for  that month/year combination by entering "M" or
         for  that  entire year by entering "Y."  For each eclipse ACE 
         lists  the  UT  date  and  time  of  the eclipse, the type of 
         eclipse,  and  the  magnitude.   For total lunar eclipses ACE 
         gives a more complete list of timings comprising beginning of 
         partial phase, beginning of total phase, maximum eclipse, end 
         of total phase, and end of partial phase.

         Example entry format: 

                     Month   Year   List[(M)onth, (Y)ear]
                     1       1986   Y
                          Astrophotography Exposures

         Use  this option to calculate, for the information you enter,
         exposure  times and image sizes needed in lunar and planetary 
         photography.

         Example entry format:

                               Object Name: Mars
                            Objective Diameter: 200
                  Focal Length (same units as diameter): 2000
                             Film Speed (ISO): 100
                        Object Diameter (" of arc): 30
                                Magnitude: -2.5
                               Phase (0-1): 0.95
                       Filter Factor (1 = no filter): 1

                       Mean Sidereal Time and Julian Day

         Use this option to find, for the date, time, right ascension,
         and  declination  you  enter,  the Universal Time, Julian Day  
         Number,  Greenwich  Mean  Sidereal  Time, local Mean Sidereal 
         Time,  hour angle,  altitude,  azimuth, airmass (th ratio
        atmospheri   interferenc  lookin towar th objec  a 
         compare t tha lookintowar th zenitho  scal o  
         t infinity wit  "***  indicatin  a  objec  belo th 
         horizon) rise an set   messagwil b displaye i th 
         objec i circumpola fro you observin site.
         site.

         Example entry format:
                                         Right Ascension   Declination
          Month Day Year   Hrs Min Sec     Hrs Min Sec     Deg Min Sec
          1     1   1986   20  0   0       0   40  0       41  40  0
                           Precession of Coordinates

         Use  this  option  to  precess  forward  or backward, for the
         epochs you enter, the coordinates of an object.  

         Example entry format:

                             From What Epoch? 1950
                              To What Epoch? 2000

                         Right Ascension   Declination
                           Hrs Min Sec     Deg Min Sec
                           0   40  0       41  40  0




                              Phases of the Moon

         Use  this  option  to find, for the month and year you enter,
         the dates and times of each phase of the moon.

         Example entry format:

                                 Month   Year
                                 1       1986








                            Equinoxes and Solstices

         Use this option to find, for the year you enter, the UT dates
         and times of the beginning of the four seasons.

         Example entry format:

                                     Year
                                     1986








                        Galilean Satellites of Jupiter

         Use this option to plot graphically the relative positions of
         the four  Galilean satellites of Jupiter.  The display starts 
         at   the  date  and  time  entered.  Each subsequent display, 
         updated  at  a rate set  by  your computer's speed (about one  
         display per second), shows to scale the satellites' positions 
         relative  to the x-axis for  the  update interval you  enter.   
         For   example,  an  update  interval  of  "60"  displays  the 
         positions as they would appear each hour.  A updat interva 
         o  "0  display  th  position  fo onl th date and time 
         entered.

         Example entry format:

           Month Day Year   Hrs Min Sec   Update Interval (Minutes)
           1     1   1986   21  0   0     60
                              Perpetual Calendar

         Use  this  option  to  display, for the month and year in the 
         Gregorian  calendar  you  enter, the calendar for that month.  
         You  may optionally request a printout of the calendar on the  
         printer you designated during the ACE installation process.

         Example entry format:

                         Month   Year   Hardcopy[Y/N]
                         1       1986   N






                                    Polaris

         Use  this  option  to  find, for the month, day, and year you 
         enter,  the  times  of  the  culminations  and elongations of 
         Polaris. 

         Example entry format:

                              Month   Day   Year
                              1       1     1986







                                   DOS Shell

         Use  this option to execute DOS commands without leaving ACE.
         To return to ACE, type "EXIT" at the DOS prompt.













                                     Exit

         Use  this  option  when  you  want  to exit from the menu and
         return to the DOS prompt.















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