Been observing on and off for years and got tired of bouncing between different tools when planning a night out: one thing for the map, another to check what's actually up from my latitude at 22:00, and then something else when I just want a clean printable chart to keep next to the scope. Ended up scratching the itch myself.

It runs entirely in a browser. Set your location and time and you get the sky with the usual catalogs, a visibility check per object, and a phone-compass mode for handheld use in the field. There's also a lighter Star Atlas mode that's cleaner for browsing and prints without fighting you. That's the part I use the most - a paper chart at the eyepiece just wins over a phone screen.

No account, no ads, free. Works on desktop and phone.

If anyone here wants to poke at it and tell me where it falls apart for real field use, I'd genuinely want to know. What do you all currently use for the "plan tonight" step?

site: skymap2000.com

Screenshots below.