SkyMargin

FOR SEESTAR OBSERVERS · CUSTOM HORIZON

The edge of
your open sky.

Turn measured angles into a skyline.
Tap the disc to add a bearing.

Circular horizon profileNorth at top, east at right. Centre is zenith; outer circle is zero-degree altitude. Boundary values are also available in the readings list.
Open above the line Obstructed below it

Invented garden example
Replace with your measurements.

0° / N → 90° / E

True-north bearings, clockwise.
Rings: 0°, 30°, 60°, 90° altitude.

No live sky or sensor measurement.
How to measure your horizon ↗

Local draft. Save a TXT before closing this tab.

Edit a bearing

Altitude is the top of the obstruction, measured from a level horizon.

All bearings

Choose a reading, or . At least two different bearings are required.