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Bug #37743 results not as expected for date_sunrise
Submitted: 2006-06-08 13:07 UTC Modified: 2006-06-08 19:11 UTC
Avg. Score:4.7 ± 0.7
Reproduced:6 of 6 (100.0%)
Same Version:3 (50.0%)
Same OS:-1 (-16.7%)
From: webdev at etzchaimkgh dot org Assigned:
Status: Wont fix Package: Date/time related
PHP Version: 5.1.4 OS: Linux
Private report: No CVE-ID: None
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 [2006-06-08 13:07 UTC] webdev at etzchaimkgh dot org
Results of the date_sunrise function do not match times as reported by U.S. Naval Observatory 
( and others

Reproduce code:
$ts = mktime(0,0,0,  6 , 7 ,2006); 
echo date_sunrise($ts, SUNFUNCS_RET_STRING, 40.8, -73.8, 90 + (50/60) , -4); 

Expected result:

Actual result:


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 [2006-06-08 13:51 UTC]
There are slight difference in algorithms for calculating those things. It's extremely hard as you have to factor in *many* different parameters (including state of the atmosphere). A two minute difference is therefore expected and not really a bug.
 [2006-06-08 19:11 UTC] webdev at etzchaimkgh dot org
I am sorry to hear that you would take such an odd position - an algorithm that comes up with different results than the U.S. government. The government does not take into account factors such as altitude an atmosphere when calculating. The computations and results should match. 2 minutes is HUGE difference - 2 seconds would be more like something one might be willing to ignore. You should at least document your "expected" difference in the manual. Thanks.
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