EclipseGPS – Eclipses

Olivier Popiers

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About this app

EclipseGPS works out the next solar or lunar eclipse for your exact position, and
tells you what you will actually see from where you are.

WHAT YOU SEE FROM HERE
An eclipse is not one single event: it differs completely from one place to another.
EclipseGPS computes, for your position, the obscuration percentage, the magnitude, the
times of first contact, maximum and last contact, and the altitude and azimuth of the
body at maximum.

COUNTDOWN
Time remaining until maximum, to the second, for the next eclipse and the ones after
it.

REMINDERS
Notifications 7 days, 1 day and 1 hour before the next eclipse visible from your
position. They reschedule themselves automatically when you travel.

PATH AND BEST OBSERVATION POINT
For a solar eclipse the map draws the central line and the successive footprints of
the shadow on the ground. If the band of totality passes within reach, the app gives
you the distance, the direction and how long the central phase lasts there.

HISTORY
Browse past eclipses, with a filter for those that were actually visible from the
selected location.

LOCATIONS
Automatic GPS position, city search, or a point picked on the map. Favourite and
recent locations are remembered.

ON-DEVICE COMPUTATION
No eclipse data is downloaded and no server is queried for the computation: the
positions of the Sun and the Moon come from on-device ephemerides (a truncated
ELP-2000/82 series) and the local circumstances from Besselian elements. The app
therefore works without a connection. Contact times are accurate to about one minute.

A connection is still needed for city search and for map tiles.

Light or dark theme, chosen or following the system. Available in English and French.