sunrise/sunset

[Your Name]

I'm trying to use date_sunrise() and date_sunset() functions in my php5
code.

I use them as follows:

date_default_timezone_set("America/New_York");
$sr = date_sunrise($i,SUNFUNCS_RET_TIMESTAMP,39.2155,-89.2177);
$ss = date_sunset($i,SUNFUNCS_RET_TIMESTAMP,39.2155,-89.2177);

The zenith is whatever the php default is set to (90.58...).

The problem I am having is that the resulting times given are about 20
minutes later than they should be (according to
http://aa.usno.navy.mil/data/docs/RS_OneDay.html).

What am I doing wrong?
Mark

[Andy Hassall]

On Fri, 06 Oct 2006 21:50:26 GMT, Your Name <em***@address.comwrote:

>I'm trying to use date_sunrise() and date_sunset() functions in my php5
code.

I use them as follows:

date_default_timezone_set("America/New_York");
$sr = date_sunrise($i,SUNFUNCS_RET_TIMESTAMP,39.2155,-89.2177);
$ss = date_sunset($i,SUNFUNCS_RET_TIMESTAMP,39.2155,-89.2177);

The zenith is whatever the php default is set to (90.58...).

The problem I am having is that the resulting times given are about 20
minutes later than they should be (according to
http://aa.usno.navy.mil/data/docs/RS_OneDay.html).

What am I doing wrong?

Not sure, I get almost the same figures.

PHP says sunrise/sunset, UTC:

"
Fri, 06 Oct 2006 11:58:16 +0000
Fri, 06 Oct 2006 23:31:19 +0000
"

The site above for the same coordinates says (snipped to the relevant bits):

"
The following information is provided for (longitude W89.2, latitude N39.2):

Friday
6 October 2006 Universal Time

Sunrise 11:58
Sunset 23:32
"

It wouldn't accept fractional minutes for the coordinates which probably
accounts for the few seconds difference.

What numbers are you feeding into the site?

--
Andy Hassall :: an**@andyh.co.uk :: http://www.andyh.co.uk
http://www.andyhsoftware.co.uk/space :: disk and FTP usage analysis tool