The DMO is a complex device and project, in this section of the blog I highlight individual components.
March 2022. To enter the dates for the constellation in the planetarium I have used the JS Orrery software. You can see a demonstration at https://demoor-orrery.com/en/dmo/dmo-operation (step 3).
The software with the planet simulation can also be played "live" without a DMO. Click here or on the picture. The link will bring you to the server-software which runs on GitHub. Press the play button in the top lef corner or fill in any desired date to see how the constellations of the planets. You also can alter the view, zoom in and out, on the solarsystem by dragging your mouse over it. Or try a different view or alter the planet sizes.