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- SkyMap Release History
- ----------------------
-
- 01-JUL-94 v2.1
-
- Times of rising, meridian transit, and setting can now be calculated for
- the Sun, Moon and planets. This is displayed on the "local" page of the
- planet information dialog, and can also be displayed in a tabular form for
- all the planets from a new "Planetary Phenomena" item on the "Tools" menu.
-
- Added a "Planet visibility" dialog giving a quick method of showing the
- positions of all the visible planets.
-
- Added the option to label planets with names, rather than symbols. A new
- planet options dialog allows selection of options for planet display.
-
- Added an option to display the dark limb of the Moon with a dotted line.
- This is useful for eclipses and occultations.
-
- Improved comet orbit calculation algorithm to avoid problems with
- comets in near-parabolic orbits. This problem sometimes caused the
- program to crash previously.
-
- Changed from the RNGC to the SAC v6 deep sky object database (by kind
- permission of the Saguaro Astronomy Club). Deep sky objects are now
- displayed on the Area Map with their correct size and (for galaxies)
- orientation. This is a major improvement in the program!
-
- Added a "black on white" display mode option to the "Colour" sub-menu.
- Selecting this option changes the map to all-black on a white background,
- similar to a printed map. This is a very useful mode in which to do a
- screen dump for pasting into a word processor or other application.
-
- Added a "night vision" display mode option to the "Colour" sub-menu. When
- selected, all displayed items change colour to red or black. This colour
- combination is the best for preserving night vision.
-
- Added the ability to display the tracks of moving planets, asteroids, and
- comets on the astrometric area map. This is extremely useful, especially for
- comets and asteroids. Also has educational value when used for such things
- as displaying the retrograde loops of objects.
-
- Added a catalogue of asteroids in the file "ASTEROID.SKY". This works in the
- same way the existing comet catalogue does - ie, asteroids can be selected
- for map display, and can be added to, edited, or deleted from the catalogue.
-
- Added topocentric RA and declination to planet information dialogs.
-
- Replaced "High Accuracy" option on the Area Map with the more meaningful
- "Astrometric" option. When this is enabled, maps are drawn to epoch J2000;
- when disabled, maps are drawn to the current epoch. It has much the same
- effect as switching off the old "High Precision", but in a more quantifiable
- manner.
-
- Added "double click" processing to all listboxes as a shortcut.
-
- Added file load/save facilities for maps.
-
- The user can now set the map window title on both the Horizon and the Area
- maps.
-
- Added a "time skip" option to the Horizon Map, allowing it to automatically
- update at specified time intervals.
-
- Added a "Map Status" option to the "Help" menu, When invoked, this displays
- a dialog showing information about the time, observation location, etc.
-
- Created a separate "SKYIMAGE" application for displaying pictures. Having
- pictures shown in a separate window greatly improves the user interface,
- since both the image and map can be viewed simultaneously.
-
- Added the facility to display the embedded comments in GIF files. These
- often contain useful information about the image, especially in the case
- of NASA/JPL images.
-
- Added altitude and azimuth display to Area map information dialogs.
-
- Added screen and printer font selection for all text drawn on maps.
-
-
- 27-DEC-93 v2.0
-
- Major release. A total rewrite of the program to make it much faster and
- to dramatically improve the user interface. Many new features added
- including display of comets.
-
-
- 10-Sep-93 v1.33
-
- Bug-fix release:
-
- Images of RNGC objects couldn't be displayed automatically on a horizon
- map, because I'd forgotten to add the line of code to do so! Fixed.
-
-
- 25-Aug-93 v1.32
-
- Bug-fix release:
-
- An error in the floating point emulation libraries of Microsoft's Visual C++
- compiler, causing the "tan" function to return the wrong sign, was resulting
- in the effects of refraction being applied in reverse on some machines
- without a maths co-processor. Applied a "work around".
-
- The colour of RNGC objects and their labels was defaulting to black on the
- horizon map. This was difficult to see against the black map background!
-
-
- 04-Jul-94 v1.31
-
- Minor bug fix release:
-
- It wasn't possible to save a configuration in which the faintest stars were
- drawn as a single pixel. Single pixel stars were replaced by 4-pixel stars
- by over-zealous error checking code when the configuration was reloaded.
-
- RNGC objects on the Area map were being incorrectly drawn and labelled using
- the star, rather than the RNGC object colours.
-
- An extra line connecting the two halves of the constellation "Serpens" was
- being drawn on the constellation outlines, because the drawing code regarded
- Serpens as a single constellation whose points were to be connected. Fixed
- by treating the two halves of Serpens as two separate constellations as far
- as the outline drawing code is concerned.
-
-
- 29-May-93 v1.3
-
- New features:
-
- The program can now display non-stellar objects. The database used is the
- Revised New General Catalogue (RNGC).
-
- Constellation boundaries can now be displayed.
-
- The printing options have been greatly expanded. When a map is printed the
- user can now select whether to print the entire map, or the current zoomed
- view, and also whether to print in black and white or colour. For colour
- maps a dialog allows the user to select the colour of each component of
- the map.
-
- All map features are now present on both the horizon and sky area maps
- (eg star labels can now be displayed on the horizon map). The user interface
- has been made more consistent between the map types.
-
- The program now has an optional ToolBar at the top of the screen, which
- provides short-cuts for the commands on the "View" menu.
-
- The program now (finally!) has a complete on-line help system. This is
- basically a copy of the manual.
-
- Bug fixes:
-
- I'd forgotten to apply the correction for diurnal parallax to planetary
- positions on the Sky Area map. Consequently, the planets were being shown
- in their geocentric, rather than topocentric positions, resulting in errors
- of up to 2 degrees in the apparent position of the Moon. Fixed.
-
- The size of the image of the Sun and Moon on the Sky Area map was being
- incorrectly calculated, resulting in images that were about 50% too large
- when the map was printed on a portrait orientation page. Fixed.
-
-
- 07-Mar-93 v1.2
-
- New features:
-
- Added a new "Sky Area" map type, centred on a right ascension and
- declination. This is intended to be used to draw a detailed map of a
- small region of the sky.
-
- Added the ability to display photographic images in either GIF or BMP
- format. Images can either be explicitly opened, or associated with specific
- objects (currently planets) and automatically displayed.
-
- Bugs fixed:
-
- Single pixel stars were being printed on the printer in the screen colour,
- which almost certainly mapped to white on the printer, resulting in them
- not being printed. On a mono print, single pixel stars are now correctly
- printed black.
-
- When the right mouse button was pressed over a horizon map to display the
- pop-up menu, then the *right*, rather than the *left* button pressed (ie,
- a user input error!) an incorrect cursor position was stored. If the left
- button was subsequently used to select an information dialog a wildly
- inaccurate position or a GPF resulted. This is probably the cause of all
- the "random number" errors previously reported. Thanks to Don Munro for
- tracking down a reproducable case of this puzzling error! Fixed.
-
- Removed the incorrect, uninitialized data displayed on the information dialogs
- for the Sun and Moon. (Eg phase 0.000 for the Sun.)
-
-
- 05-Feb-93 v1.11
-
- When the start of a constellation figure was off the edge of the map,
- the first visible line of the constellation was being drawn incorrectly in
- certain circumstances. Fixed.
-
- The correction for refraction was being correctly calculated and correctly
- displayed in the "About" box for a star, but not applied to the plotted
- position of the stars on the map. This led to stars being plotted with
- slightly too low an altitude (the maximum error being about half a degree
- at the horizon). Fixed.
-
- If the star position calculation was aborted by the user pressing the "Cancel"
- button, the subsequent constellation figure setup calculation code displayed
- an error message for each star it was unable to find. Pressing the "Cancel"
- button now aborts the map calculation cleanly.
-
-
- 31-Jan-93 v1.1
-
- Test release to BIX only for testing.
-
- In the "Observer" dialog, the "Time Difference" edit field was only wide
- enough to allow two digits to be entered, making the program not too
- useful for anyone outside the GMT time zone. Fixed.
-
- Version 1.0 of SkyMap simply plotted stars in their mean catalog position.
- This version now rigorously calculates the apparent place for the time of
- observation, correcting for proper motion, aberration, precession, nutation,
- and refraction.
-
- Added code to verify that dates are in the range 4000BC-8000AD (the
- range over which the planetary position equations are valid.
-
-
- 24-Jan-93 v1.0
-
- Release of SkyMap 1.0, with basic facilities for drawing horizon map and
- plotting planetary and lunar positions.
-