You are at the center. Moon (crescent) and Sun (with rays) are fixed points in the sky. Aircraft move as FR24-style silhouettes — green if transiting, grey otherwise. If below the horizon they appear faded on the edge with a direction arrow.

How many km around you we query for aircraft. 25 km is the optimal value to avoid noise.

The tolerance to call an aircraft 'in transit'. Moon and Sun are ~0.5° in diameter. At ±0.5° you only catch true disk transits.

Install the app and enable notifications to receive alerts even with the phone in your pocket. The 'Enable notifications' button appears in Settings. After enabling, tap 'Register' to link your device to the server.

With the 'Background notifications' toggle enabled in Settings, the server checks transits every minute and sends you a push even with the app fully closed. Your GPS position is automatically updated every 5 minutes while the app is open. Disable the toggle at any time to stop everything instantly.

The green section shows real transits with a countdown. The grey 'Nearby aircraft' section shows all other aircraft with two values: 'now' is the current angular distance; 'min' is the minimum it will reach in the next 10 minutes. If 'min' drops below your margin, the aircraft moves to green.

Geographic map showing all aircraft in the visible area. Yellow FR24-style icons — green if transiting. Zoom or pan and the search updates for the new area (up to 450 km). Tap any aircraft for callsign, altitude, speed, type, registration, vertical rate, squawk and — if available — airline, departure and arrival.

Live camera feed with aircraft, Moon and Sun overlaid at their real sky positions. Computed from the aircraft ADS-B GPS + your phone compass + gyroscope — not computer vision. On iOS tap 'Enable compass'. Transiting aircraft show a green dashed line toward their target. Tap an aircraft for a quick callsign and altitude popup.

Tap any aircraft on the map or in AR for full ADS-B data: altitude, speed, heading, vertical rate (▲▼), squawk and coordinates. Each field has an 'i' icon with an explanation. If the flight is in the AirLabs database you'll also see airline, departure/arrival airport and flight status.

In Settings you can define when it makes sense to photograph a transit. Filters are based on elevation — how high the moon or sun is in the sky at that moment.

Before heading out to shoot, find out how large the Moon (or Sun) will fill your frame and how much space a transiting aircraft will occupy on the disk. Choose subject, camera body, focal length and aircraft type: the canvas shows true angular proportions and animates the transit. Use the "aircraft vs lunar disk" stat as a guide: ≥30% great, ≥15% decent, <15% the aircraft risks getting lost in the disk. The aircraft is simulated at 10 km from the transit point.