Dome Geometry v8.13.001 9c08
Telescope points at—Required dome az—Intersection alt—Aperture clearance—
Key
  • Wireframe dome — upper hemisphere, sitting on the wall down to your measured floor height
  • N / E / S / W — cardinal directions at the dome wall
  • Small bar — OTA
  • Amber line — optical axis
  • Glowing strip — the shutter door, full height, tracking azimuth only, like a real slit dome
  • Thin ring at the dome surface — each OTA's actual aperture footprint; if it pokes past the door's edge, that part is vignetted
  • Rust-colored skyline — your local horizon limit, from the Local Horizon card
  • Blue arc — the celestial equator (Dec=0), traced on the dome shell; genuinely tilts with latitude, crossing the horizon due East and due West
  • Bright dot — the elevated celestial pole, at altitude = your latitude on the North (or South) horizon-to-zenith line, where a polar-aligned GEM's RA axis points; HA=0 and GEM meridian flips happen along that same line
Drag to orbit · scroll to zoom

Telescope Pointing

Drives the live azimuth calculation and the 3D preview, using the exact same math NINA runs internally.

°
0 = on the meridian, + = west of meridian
°
°
AP park
1°
Step size
Hold to keep jogging. Nudges whichever pointing mode is active above.
RA
Dec
Alt
Az
✓ Valid pointing — the shutter clears and everything checks out.
Pier East
Pier West
Reading this

Center = zenith, edge = horizon, up = North, right = East. Updates live as you change your setup.

● Green — shutter clears
● Red — vignettes or misses the dome entirely
● Brown — below your local horizon, not observable regardless
● Grey — mount geometry invalid there