While most focus on deep sky, ST4 predicts mutual event phenomena (Jupiter moon eclipses, Saturn ring tilt angles) with arcsecond accuracy. It also models comet tail positions using real orbital elements from the Minor Planet Center.
The SkySim feature overlays your exact FOV on a DSS (Digitized Sky Survey) image. You can rotate your camera angle virtually to see if the galaxy’s dust lane fits perfectly diagonally. sky tools 4
SQM (Sky Quality Meter) readings are not just data points in Sky Tools 4—they are actionable. You can input your specific Bortle class or SQM value, and the software will automatically dim or hide deep-sky objects below your visibility threshold. If M101’s surface brightness is drowned out by your suburban sky, Sky Tools 4 will suggest a brighter, smaller target instead. While most focus on deep sky, ST4 predicts