ZET 

ZET is a utility created for astrologists that includes astronomy data making it a good tool for learning astronomy as well.

The program helps one to study a natal chart and make predictions regarding future life trends. The natal chart is interactive and actions such as selecting planets and requesting for an aspect grid, an interpretation or a description to be displayed can be performed.

Aspects such as conjunction or trine will be made clear for each planet in the chart. Descriptions can be consulted for each astrological sign. Transit and synastry charts can be created by the application. Several settings can be adjusted where charts are concerned. A sky view can be used for learning the constellations.

Tables containing various useful information can also be consulted, such as a star and an asteroid catalog or the general house table. A geographical Earth map is also included, not a very detailed one however.

In conclusion, ZET is a utility for astrologers as well as a tool for getting introduced to astronomy.