(PC-1211 / PC-1) Sunset/Sunrise time

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An extract from Shortwave Radio Listening with the Experts, SAMS, COMPUTERS and DX'ING, page 161

Fig. 10-6. The National Radio Club’s Sunset/Sunrise time computer program.

                       SUNTIMES—A COMPUTER PROGRAM
                             Ronald F. Schartz
        The following BASIC computer program is especially
designed for use with the Sharp PC-1211 or the TRS-80 pocket
computers. It is a simple but reasonably accurate program
that will calculate the times of sunrise and sunset for any
point on earth. While the version of BASIC employed by these
units is surprisingly sophisticated for a computer that is
only twice the size of most calculators, their limited
memory and display area demand a relatively conservative,
economical program philosophy as compared to larger systems;
this is reflected in the foregoing program.

Setting Mode to PROGRAM:

   

Times are automatically calculated in UTC (GMT):
local-time calculation can be performed by adjusting the
longitude to your prime meridian; e.g., add “75” to the
longitude for EST. Enter all “S” latitudes and “W”
longitudes as negatives. The “Season” entry refers to the
Northern hemisphere only.

     Comments on SUNTIMES are invited, preferably via
Musings.

BEST!
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