I find the sliders helps to give a more accurate idea of where exactly the sun will rise/set at a given time of year. However it only seems to do it for the date set on your computer.
This is really embrassing,
I have just opened Google Earth to find the slider is now missing since I updated it a few days ago.
The link below may help you find it on your version, you need to scroll to the bottom of the page, under "Displaying The Sun", and it tells you how to activate the slider.http://earth.google.com/userguide/v4/
If you want to edit any of my images to demonstrate points/techniques to either myself or others please feel free to do so.
Still learning with Canon 40D, 28-135mm, 100-400mm L and Elements 6.
Any Advice greatfully received.