Avoid double counting the 15 minutes radial correction of the sun

Author: carlosbuenosvinos

ext/date/php_date.c

@@ -5418,7 +5418,7 @@ PHP_FUNCTION(date_sun_info)
 	array_init(return_value);
 
 	/* Get sun up/down and transit */
-	rs = timelib_astro_rise_set_altitude(t, longitude, latitude, -50.0/60, 1, &ddummy, &ddummy, &rise, &set, &transit);
+	rs = timelib_astro_rise_set_altitude(t, longitude, latitude, -35.0/60, 1, &ddummy, &ddummy, &rise, &set, &transit);
 	switch (rs) {
 		case -1: /* always below */
 			add_assoc_bool(return_value, "sunrise", 0);

ext/date/tests/bug-gh18076.phpt

@@ -0,0 +1,12 @@
+--TEST--
+GH-18076 (Since PHP 8, date_sun_info() returns inaccurate sunrise and sunset times)
+--FILE--
+<?php
+date_default_timezone_set("UTC");
+$sun_info = date_sun_info(strtotime("2025-03-21"), 51.48, 0.0);
+echo date("H:i:s\n", $sun_info['sunrise']);
+echo date("H:i:s\n", $sun_info['sunset']);
+?>
+--EXPECT--
+05:58:41
+18:13:41