Category : Science and Education
Archive   : DAYLIGHT.ZIP
Filename : DAYLIGHT.DOC

About DAYLIGHT 89/07/18
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DAYLIGHT calculates the hours of daylight at a given point on the Earth's
surface when given a Date and Time Zone.

When the program starts up, the position is set to the LATITUDE and LONGITUDE
of Calgary, Alberta, Canada, which is where I live. The DATE is origionally
set to the date stored in your computer's system clock.

This program started life in BASIC on an Apple II. A friend of mine found it
and got it to run on the IBM PC for his scout troop. He gave me a copy and
I rewrote the program in Turbo Pascal and gave it a better user interface.

While rewriting the program, I restructured it so much that I doubt you will
recognize the origional BASIC program as its ancestor. This was done to make
the program readable (not more readable, readable period: no one but an
astronomer would probably understand the program by casually reading it).
I also restuructured the code to make it more portable (I plan to do a
Macintosh version).

- Variables were given meaningful names.
- Constants were identified and their meaning identified (if I could)
- Calculations were separated from user interface code for portability
- Code was modularized (again for portability)

I've included the BASIC program so you can compare it with the Pascal.

If you have any comments or suggestions, please drop me a line.


Mike Babulic Compuserve: 72307,314
3827 Charleswood Dr. N.W. Connect: BABULICMG
Calgary, Alberta
CANADA
T2L 2C7