This rainmeter skin shows the position of the sun and moon based on the time, date and where you are on planet Earth. The sun and moon images are hauled up chains to their highest points above the horizon from whence they fall to sunset or moonset. You will need the latest beta version of Rainmeter to run the skin. Get it from here rainmeter.net/cms/
Hover your mouse pointer over the sun/moon images for info on the rise and set times. Hover over the cycle wheel at the top to see the twilight hours and plan your sky-watching and/or artistic activities accordingly.
You can toggle the exhaust fireball images on and off by clicking on the rotating cog in the bottom-left.
You will need to enter your latitude, longitude and timezone for the whole thing to work properly. Do this by left-clicking on the cycle wheel at the top and following instructions in the UserVariables.inc file.
UPDATE: 18 Jan 2013 - added a clock which you can toggle on/off by clicking on the panel which shows 'Twilight' in the above screenshot.
UPDATE: 31 Mar 2013 - corrected the problem with daylight savings times.