237bc42084
I also reworked how the Java and Kotlin demos process errors in the command line arguments. Using exceptions that are caught by main() rather than directly exiting the process where the errors are detected.
Astronomy Engine examples in Java
The class file Main.java shows examples of how to use the Kotlin version of Astronomy Engine from a Java program.
The demo program is split into separate source files, one for each topic, as listed below. Each topic is chosen by a command line parameter. To build the demo program, run this command in Linux or Mac:
./gradlew jar
On Windows, use this command to build the demo program:
gradlew.bat jar
Then use the rundemo script (or rundemo.bat file on Windows) to
run the demo program, to see usage text:
./rundemo
As an example, to run the MoonPhase demo, try this:
./rundemo moonphase
MoonPhase.java
This example shows how to determine the Moon's current phase, and how to predict when the next 10 quarter phases will occur.
Positions.java
Given an observer's geographic latitude and longitude, and an optional date and time, this demo displays the equatorial and horizontal coordinates of the Sun, Moon, and planets.
Seasons.java
Calculates the equinoxes and solstices for a given calendar year.