#37743 [WFx]: results not as expected for date_sunrise

ID: 37743 User updated by: webdev at etzchaimkgh dot org Reported By: webdev at etzchaimkgh dot org Status: Wont fix Bug Type: Date/time related Operating System: Linux PHP Version: 5.1.4 New Comment: 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. Previous Comments: ------------------------------------------------------------------------ [2006-06-08 13:51:57] derick@php.net 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 13:07:56] webdev at etzchaimkgh dot org Description: ------------ Results of the date_sunrise function do not match times as reported by U.S. Naval Observatory (http://aa.usno.navy.mil/data/docs/RS_OneDay.html) 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: ---------------- 5:24 Actual result: -------------- 5:22 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=37743&edit=1