UTC Clock is a simple application that displays the actual UTC time right under the status bar of your Mac; this freeware tool will also provide you with direct access to dozens of useful websites that come in handy on a daily basis.
When launching the program for the first time, you will notice a new window under your status bar where you can check the time and date. Unfortunately, a relevant disadvantage of using this application is the fact that you won't be able to adjust the tool's settings according to your needs, which means that you can't change the time and date, move the program's window, modify the interface's appearance, etc.
However, you will have direct access to a wide range of useful webpages that you might find of interest; you will easily find weather reports, the variations in the Earth's magnetic field (earthquakes), Earth's view at the current time and so on.
Finally, to sum it all up, it's worth trying UTC Clock application, as it offers detailed information regarding the time and date as well as it gives you access to a large number of websites where you can check the Earth's and solar activity.