Eclipse Map, by Greg A. Miller, is an Android planning app for eclipse observers, astronomers, and photographers that translates astronomical data into map-based plans. The app turns canonical eclipse data into an interactive Google Maps overlay and computes local contact times plus totality duration for any chosen point. It reports solar altitude and azimuth and uses device GPS for location-aware calculations. Serious eclipse chasers and photographers gain timing and framing information for field planning.

What the app turns celestial mechanics into

The app converts canonical eclipse records into precise local circumstances, drawing on a 5,000-year eclipse database to deliver exact contact times (C1 through C4) and the computed length of totality for any map coordinate. That output gives observers concrete windows for setup and image capture, presenting numerical timing rather than narrative summaries so planners can schedule equipment, transit, and observation sequences with confidence.

How mapping and location work for field planning

Mapping is built around an interactive Google Maps overlay and device location, so users place crosshairs or rely on GPS to get site-specific data. The interface shows the center line and umbral limits visually, and the app requires Google Play Services to support the map layer. Those map mechanics let users evaluate on-route viewing sites and compare center-line proximity visually before committing to a location.

Why its timing and solar geometry support photography

Timing accuracy rests on established astronomical computations, employing high-precision Besselian element methods to derive contact times and durations. In addition, the app reports solar altitude and azimuth for a selected point, information photographers use to plan composition, tripod alignment, and exposure windows rather than estimating sun placement from rough schedules.

Who benefits most and practical trade-offs

The tool is aimed at serious eclipse chasers, amateur and professional astronomers, and photographers; the community values its technical accuracy and the lack of extraneous features. Although it prioritizes the umbral path and raw data presentation, that focus makes it less of a casual-reference viewer and more of a planning instrument for people comfortable with astronomical terms and precise numeric outputs.

A focused planning companion for precise eclipse work

The app is a disciplined companion for observers and photographers who require reliable local timings and solar geometry for field shoots, supporting careful logistical and compositional planning. Although it expects users to interpret numeric outputs rather than rely on guided tutorials, its factual, map-based presentation serves expedition-level preparation and scientific observation where exact local circumstances matter.