Downloading HR_Calc 1.2 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The application is also known as "HRCalc". The actual developer of this free Mac application is com.byteconduit.
You can execute this free app on Mac OS X 10.7 or later. 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. The most popular version of the application is 1.2. HR_Calc for Mac lies within Education Tools, more precisely Science.
From the developer:
HRCalc is an astronomical calculator used to derive properties of stars given a star's luminosity and surface temperature. With these values, HRCalc can derive the radius of a star and display stellar size relationships using graphical models.
HRCalc allows you to experiment with various luminosity and temperature settings to determine the effects of these parameters on a star's theoretical size.
You may want to check out more software for Mac, such as MacSpice, Periodic Table or Mercury, which might be similar to HR_Calc.