Astro Calculator
The astro-calculator converts astronomical coordinates from one system to another.
The Astro-Calculator is opened by:
- clicking the
"Tools" Toolbar button,
and selecting 
"Astro Calculator..."
from the menu,
- selecting "Tools" | "Astro Calculator..."
from the main menu.
When the astro-calculator is opened it is preloaded with coordinates appropriate to the tableau or current operation of the software. Changing the data in any field results immediately in a corresponding alteration to data in equivalent fields.
The astro-calculator is sensitive to the effect of precession on stellar coordinate systems.