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ASTRNOMY
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STARVIEW.ZIP
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STARVIEW.DOC
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1988-02-03
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Digi-Tech StarView 1.0.09 of 18Jan88
(c)1988 Digi-Tech Consultants. All Rights Reserved.
Invoke with StarView [path]
where path is the optional drive and/or directory containing the
device drivers and data files.
StarView is a non-commercial product of Digi-Tech Consultants.
You may use it freely, and distribute copies to others as long
as no fee of any kind is charged and the program and supplied
data files remain unmodified.
A contribution of $30 would be appreciated, and entitles you to
suggest improvements and point out errors in the software.
Corporate usage or distribution with a product requires a license.
Brian McMillin
Digi-Tech Consultants
P. O. Box 12144
Dallas, TX 75225
The use of a mouse is recommended.
Change parameters by clicking or dragging the bar graphs.
Reposition the display by dragging in the starfield:
Up and Down change Declination.
Left and Right change Right Ascension.
Position the cursor near a star to see its identification.
Use Up and Down arrow keys to change declination.
Use Left and Right arrow keys to change Right Ascension.
Ins and Del rotate the display.
Home and End zoom in and out on the display.
PgUp and PgDn change the limiting magnitude displayed.
Letters select a constellation (highlighted by blinking).
+ and - step through alphabetized constellation abbreviations.
Space clears the selected constellation.
f1 inverts the image f2 displays this Help info
f3 selects clock drive f4 selects time rate
f5 change display colors f6 display Mag or Spec Class
f7 select spectral classes f8 select coordinate Epoch
f9 set observer info f10 toggles drive on/off
This version of StarView implements display of objects in
the solar system. These objects can be observed at any
time or date by setting the observer info (f9).
The displayed date and time can be set to the current local
time by pressing Alt-f10.
The displayed coordinates are either for the Epoch of Date, or
Epoch 2000.0. Toggle with f8.
A tabular display of the positions of solar system objects may
be obtained by pressing Alt-f9.
The horizon at your location will also be visible as a short
line in the field. "Below Horizon" means the center of the
field is below the horizon.
You may center the display on any object by pressing Enter
and typing in any of the following identifications:
name common name or abbreviation (SUN, VEGA)
nn XXX Flamsteed Number and Constellation
ggg XXX Greek letter abbreviation and Constellation
HR=nnnn Yale Catalog Number
C=XXX Just a Constellation designator
RA=hh.hh Change Right Ascension to decimal hours
DEC=dd.dd Change Declination to decimal degrees
In addition, you can directly set some display parameters:
ROT=dd.dd Change display rotation to decimal degrees
F=nn.n sets the field width
M=nn.n sets the limiting magnitude of the display
LAT=dd.dd Observer's Geographic Latitude (degrees)
LON=dd.dd Observer's Geographic Longitude (degrees)
ALT=nn.nn Observer's Altitude above sea level (meters)
ddMMMyy Display Date (e.g. 12MAR88 or 00JAN2000)
hh:mm:ss Display Time (must be hours, mins and secs)
hh:mm:ssU Display Universal Time (must have U on the end)
The first time you run StarView, you will see the graphics
selection screen and the observer information screen.
You should enter selections for screen mode and colors,
as well as you latitude, longitude and time zone.
This information will be retained in the file StarView.OBS.
You can recall the Graphics setup screen by pressing f5.
You can change your observer parameters by pressing f9.
The observer screen also allows you to enter a specific time
and date for your observations.
An automatic drive feature is included. This simulates the
view in an actual telescope with a fixed mount, or an
equatorial mount with R. A. clock drive.
Select a drive rate with f3.
Toggle the drive ON and OFF with f10. If the drive is OFF
time will not change automatically.
If the drive is Locked and ON, the stars will move at the rate
of the Earth's rotation.
If the drive is Solar Rate ON, the stars will move at the rate
of the Sun.
Sidereal Rate will change only the positions of the horizon and
solar system objects; the stars will remain fixed.
Lunar Rate ON will move the stars at the rate of the moon.
Select a time multiplier with f4. Choices are real time,
as well as 10, 100 and 1000 times normal.
The following files are required for operation of StarView:
StarView.EXE executable program
StarView.IDs Bayer and/or Flamsteed IDs (text)
StarView.NAM Common names of certain stars (text)
StarView.SIN Trig Table (binary)
StarView.BIN Star Coordinates, Magnitude and Spectral Type
StarView.MAX Number of valid objects in StarView.BIN
In addition, the following graphics device drivers are supplied.
ATT.BGI AT&T 400 line graphics
CGA.BGI IBM Color Graphics Adapter
EGAVGA.BGI IBM EGA and VGA
HERC.BGI Hercules Graphics Adapter
PC3270.BGI IBM 3270/PC Driver
All files must be in the path specified in the command line.
This version of StarView requires approximately 400 Kb of memory.
The database for this program is derived from the 4th edition
of the Yale Bright Star Catalog and contains 9096 stars.
Coordinates are Epoch 2000.0.
No non-stellar fixed objects are included in this version.
You may add your own data to the list of fixed objects
used by StarView. The File StarView.ADD is a text file which
will be read after all the standard objects are loaded.
The format of each line in StarView.ADD is as follows:
Right Ascension in decimal hours
Declination in decimal degrees
Magnitude in decimal
Name optional 15 byte text designation
The text is free format, but values for all three numbers
are required on each line.
There are limitations on the number of objects you can add,
based on compile-time declarations and the number of objects
in the distribution database. You should be able to specify
more than 500 objects with names without problems.
To make more room for your own objects, make the value in
StarView.MAX smaller (fewer objects in standard catalog).
Be sure to use Epoch 2000.0 coordinates in your data.
StarView contains information on the SUN, MOON and ZENITH (for
horizon display). Orbital elements for the planets are contained
in the file StarView.ELE. You can add your own data for
planets, comets, asteroids, etc. to those listed.
The format of each object in StarView.ELE is as follows:
Name Up to 15 character name for the object
Epoch in decimal Years
Period in decimal Years
Eccentricity in decimal
Longitude at Epoch in decimal degrees
Longitude of Ascending Node in decimal degrees
Inclination in decimal degrees
Semi-Major Axis in Astronomical Units
Diameter at 1 A.U. in arc seconds
Brightness in A.U. squared