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#!/usr/bin/perl

...

print "$lat\n";
print "$lon";

# Round (.5 rounds up)
$num = int($num * 1000000 + 0.5) / 1000000;

# Truncate towards 0.
$num = int($num * 1000000) / 1000000;

$lon = sprintf('%.6f', $declon);
$lat = sprintf('%.6f', $declat);

#!/usr/bin/perl

...

printf("%.6f\n", $lon);  # -88.999999
printf("%.6f\n", $lat);  # 44.111111

#!/usr/bin/perl

...

printf("%.6f\n", $declon);   # -89.000000
printf("%.6f\n", $declat);   # 44.111111