SubRosaSoft DesktopSun 1.0 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. This free Mac application is a product of SubRosaSoft. SubRosaSoft DesktopSun for Mac lies within Education Tools, more precisely Science.
From the developer:
SubRosaSoft DesktopSun downloads real time pictures of our Sun (Sol) from the SOHO observatory and sets it as your desktop picture. If left running it will update this map every 6 hours. A fascinating toy and useful tool
You may want to check out more software for Mac, such as PropCalc, Capacitor Lab or wandora-start, which might be similar to SubRosaSoft DesktopSun.