It is an online calculator for Solar Noon at your QTH.
Solar Noon is when the sun is at its highest and the shadow cast is at its shortest; the shadow should then be pointing directly North - South. Useful for aligning antennas accurately, if you don't have a GPS.
First obtain the Latitude and Longitude coordinates of your antenna's location (which you can acquire from Google Maps - just click on the exact point with your mouse and a label will appear with the selected location's decimal coordinates).
Then go to the Solar Noon web page [here]
Then plug in the Latitude and Longitude coordinates into the fields provided. Remember to set your time zone (as GMT +2 hours for local time).
Then the web page prints out a year's table with the exact Solar Noon times for each of the 365 days.
Below is an example of the process done for the CTARC clubhouse's (approximate) location:
