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    <p>Curiously, when I compile and run the nethack example I get "2" as the answer ("First Quarter" which is the same as your port)</p> <pre><code>#include &lt;time.h&gt; static struct tm * getlt() { time_t date; (void) time(&amp;date); return(localtime(&amp;date)); } /* * moon period = 29.53058 days ~= 30, year = 365.2422 days * days moon phase advances on first day of year compared to preceding year * = 365.2422 - 12*29.53058 ~= 11 * years in Metonic cycle (time until same phases fall on the same days of * the month) = 18.6 ~= 19 * moon phase on first day of year (epact) ~= (11*(year%19) + 29) % 30 * (29 as initial condition) * current phase in days = first day phase + days elapsed in year * 6 moons ~= 177 days * 177 ~= 8 reported phases * 22 * + 11/22 for rounding */ int phase_of_the_moon() /* 0-7, with 0: new, 4: full */ { register struct tm *lt = getlt(); register int epact, diy, goldn; diy = lt-&gt;tm_yday; goldn = (lt-&gt;tm_year % 19) + 1; epact = (11 * goldn + 18) % 30; if ((epact == 25 &amp;&amp; goldn &gt; 11) || epact == 24) epact++; return( (((((diy + epact) * 6) + 11) % 177) / 22) &amp; 7 ); } int main(int argc, char * argv[]) { printf ("phase of the moon %d\n\n", phase_of_the_moon()); } </code></pre> <p>output:</p> <pre><code>&gt; a.out phase of the moon 2 </code></pre> <p>But that doesn't seem like the right answer, as today, weatherunderground.com and alt.org reports the phase of the moon as "Waxing Gibbous" (a.k.a 3).</p> <p>I tried remove the "-1900" but that didn't result in the right answer either.</p>
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    1. POHow to port this NetHack function to Python?
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    1. USMike Miller
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    1. COThat is curious. Maybe I need to adjust my system clock and see what results NetHack reports on which dates. Perhaps that function is simply inaccurate. I mean the function may have been written circa 1987, all of those rounded values (as described in the function's preamble comment) may have caused the results to drift from where they should be by a day or so. Just a thought.
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