Different sunset time? What???

[haring]

I am going to photograph a wedding in Miami in April 2011.
I have noticed that different websites give different sunset/sunrise times! Sometimes there is one hour (!) difference... It is a lot!

For example if you look for the sunset time for Miami for 04/23/2011 on this website:
Sunrise and Sunset for U.S.A. – Florida – Miami – coming days
or this one:
Sunrise & Sunset Times by Zip Code

The sunset time is: 7:48pm

On the NAVY's website: http://www.usno.navy.mil/USNO/astron...rs-one-year-us

It is 18:48= 6:45pm!!!

Can somebody explain this to me???
I am sure others have faced this problem as well.

[Niresangwa]

No idea...this is the one I use

The Golden Hour Calculator / Sunrise and Sunset information for photographers

[Mike367]

Daylight savings time and standard time are 1 hr. apart. As for the other 3min., I don't know.
Latitude?

[Jim Poor]

There are "different" sunsets too, especially for the Navy and other military operations.

Be sure you're not looking at Nautical Twilight, etc.

[ravncat]

Civil Nautical and Astronomical twilight
Accounts for that. In that order, you'll want the civil time, it's a good idea to know your surroundings too, being at different elevation or near large obstacles ( though mountains are not a problem in florda, groups of trees can be)

Golden hour starts before sunset / sunrise

I highly recommend the photographer's ephemeris. iPod app costs, pc version is free