Sky dome ·

Drag to look, pinch or scroll to zoom. Tap an image to fly to it. Arrow keys step targets, Esc clears.

No image selected.

Move speed 1.0×

Screen rotation 0°

If the horizon runs vertically or the view is upside down, hold the device the way you normally would and tap level horizon. Measured once and remembered.

Magnetic declination 12.7°

Compass offset 0°

Steadiness 60

Declination turns magnetic north into true north (12.7° for Sydney). Compass offset corrects your phone’s own error — nudge it until a bright star lines up.

Sidereal rotation (LST) 80°

Latitude -33.8°

When you pick a target

Spin sky moves the LST so the target sits high overhead. Keep sky put leaves the sky where it is, so a target that's below the horizon stays below it.

Image opacity 100%

Backdrop

Star names

RA/Dec grid

Tour order

Across the sky hops to the nearest neighbour each time. By distance travels outward from the closest object to the furthest.

Debug overlay

Horizon

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