Open Source KStars is the most feature-rich free astronomy software for Linux, macOS, and Windows
KStars caters to a wide-variety of use cases. Whether you are a student, an educator, an amateur astronomer or an astronomy enthusiast, you will find tools in KStars that are useful to you.
Graphical simulation of the sky with the planets, up to 100 million stars, 10000 deep-sky objects, comets and asteroids, with adjustable simulation rate.
It has complete astrophotography workflow (with extensive support for INDI, KStars can control almost any sort of astronomical equipment, including telescope mounts, motorised focusers, filter wheels and CCD and CMOS cameras), and a host of tools that predict conjunctions, plot time variation of positions of planets, perform calculations etc. It can therefore be a powerful observation planner to plan your observations.
See
KStars - Desktop Planetarium
The most feature-rich free astronomy software

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