This tab show details of the eclipse contact and allows you to modify various settings (including latitude, longitude, altitude, ΔT and the timezone).

You can share the “eclipse circumstances” (as they are known) with friends. They may be able to view a webcast of the eclipse from the chosen location; you can adjust the timezone to match their timezone before you send out the details.

The timezone is usually set automatically according to the location you’ve chosen. In some circumstances, particularly for islands in the South Pacific, the nearest large city does not provide the correct timezone. You can adjust this manually as you need.

ΔT is observed, and predicted, by the International Earth Rotation Service (IERS). It synchronizes the rotation of the Earth (“astronomical time”), with the time kept by atomic clocks (“civil time”).

Eclipsareon automatically fetches ΔT up to 365 days in advance of an eclipse. Choose “IERS” as the ΔT setting to keep this value matching the current prediction.

Clock error is estimated using Network Time Protocol (NTP) to compare the device’s clock with the correct time. Due to limitations of the device, it is not possible for Eclipsareon to correct your clock.

Internet requirements

ΔT is updated once per day when the app starts. It downloads less than 40K bytes of data. These values ared stored for use when there is no internet connectivity.

The clock error is also cached for later use. However, no attempt is made to estimate the clock drift that may have occurred since the last time the error was calculated.