date_sunrise()

I wish to get a grasp of date sunrise and I am using Sydney Australia
as an example..
The only info I can grasp is it takes the format of..
date_sunrise(mixed time [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]])

What formats are available in int format?
How do I express a latitude of 33°56' S as a float?
What is the zenith value?

hoping Moshe will see this
Kind regards
kevin

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Kevin Waterson
Port Macquarie, Australia

This one time, at band camp, "moshe doron" mosdoron@netvision.net.il wrote:

What is the zenith value?
azimuth to the center of the sun. 90.83 say u start to c the first linear
sunshine.

I keep getting this error when I use a unix timestamp.
Warning: date_sunrise(): date must be timestamp for now

Kevin

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| / / _ ) / _ | / ) / _ )
| | ( (/ / ( ( | |( ( ( (/ /
|| _) _||| _) ___)
Kevin Waterson
Port Macquarie, Australia