Light Window Compare Compare golden light, blue light or above-horizon solar windows across two to four saved locations on the same local calendar date. 1. Save locations with their coordinates and time zones, then open Compare. 2. Choose a local calendar date and light band. Select two to four locations and calculate. 3. Review the windows in each location’s time zone, then save or share the frozen comparison. Golden light uses geometric solar elevations from -4 to +6 degrees; blue light uses -6 to -4 degrees. Results are astronomical estimates, not weather forecasts. Terrain, buildings, cloud cover and atmospheric refraction are excluded. Daylight-saving dates can contain 23 or 25 hours. Locations use their own local date, not a shared UTC instant.

Expands the local sun, moon, and sky planning bench with field-focused light windows, lunar context, sky-event references, and shadow-planning tools. Saved locations and plans remain on device.

FieldCommand: Multi-location light windows, route buffers, and a field call sheet. - Lock locations, date, time zone, target direction, and access limits - Add solar, lunar, twilight, shadow, and focal-length objectives - Build travel, setup, safety, and teardown buffers around each window - Define a backup scene and equipment fallback for every critical shot - Export a call sheet with calculated data and manual condition checks

This update sharpens the interface: the iPad layout now uses a centered, comfortable reading width instead of stretching edge to edge, plus small display fixes. iPhone is unchanged; still fully on-device.

GoldenHorizon 2.0 — six new pro tools for sky and astrophotography planning, still 100% offline. • Exposure Calculator: ND long-exposure with stackable filters, EV, Sunny-16 table, and an equivalent-exposure solver. • Moon Distance & Size: Meeus distance, supermoon scale, angular diameter, and optical libration with limb guidance. • Find-When Solver: the days the sun or moon rises or sets at the bearing you want. • Panorama Planner: rows, columns, pan/tilt steps, and output megapixels for your lens. • Stacking Planner: how many subs for a target signal-to-noise or a time budget, with deep-sky presets. • Sky Almanac: equinoxes, solstices, cross-quarters, and full/new moons with blue-moon flags. All astronomy and optics math is computed on-device and oracle-verified. No account, no network — everything stays on your device.

What's New — GoldenHorizon 1.1 Night Exposure Calculator (NPF Rule). Know the exact maximum shutter speed before stars smear into trails on your specific camera. The NPF Rule (Frédéric Michaud / Société Astronomique du Havre) accounts for your sensor's pixel pitch, aperture, and the sky declination of your target — not just focal length. Pick your camera body from the 36-body library, set aperture and focal length, choose a sky target (Milky Way core, Orion, Andromeda, Pleiades, or free-enter any declination), and read the NPF limit alongside classic 500 and 600 rule estimates. The recommended shutter is rounded down to the nearest real camera setting (1 s – 30 s ladder) so you can dial it in on location. Hyperfocal Distance Calculator. Find the precise focus distance where foreground to infinity is acceptably sharp. Choose camera body, focal length, aperture, and circle-of-confusion precision — standard (÷1500) for general use, conservative (÷1730) for 24 MP+ sensors, or fine (÷2000) for 40 MP medium-format bodies. A live focus-distance slider shows the near and far depth-of-field limits updating in real time, with a success banner when you reach the hyperfocal point. Tap the m/ft toggle to switch between metres and feet.

GoldenHorizon 1.1 adds a Shot Planner (camera sensor picker with live field-of-view, saved locations, reminders, CSV export), a Locations manager with GPS auto-fill, moonrise/moonset on the Today tab, and planet tracking. Fully offline astronomy — no account, no tracking.