32 lines
806 B
C++
32 lines
806 B
C++
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#include "ephemeris.hh"
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/* | t0e tow | - > tow - t0e, <3.5 days, so ok
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| t0e tow | -> tow - t0e > 3.5 days, so
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7*86400 - tow + t0e
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| tow t0e | -> 7*86400 - tow + t0e > 3.5 days, so
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tow - t0e (negative age)
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| tow t0e | -> 7*86400 - tow + t0e < 3.5 days, ok
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*/
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int ephAge(int tow, int t0e)
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{
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unsigned int diff;
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unsigned int halfweek = 0.5*7*86400;
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if(t0e < tow) {
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diff = tow - t0e;
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if(diff < halfweek)
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return diff;
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else
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return -(7*86400 - tow) - t0e;
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}
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else { // "t0e in future"
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diff = 7*86400 - t0e + tow;
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if(diff < halfweek)
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return diff;
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else
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return tow - t0e; // in the future, negative age
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}
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}
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