Twilight Screen

This screen shows the rise, transit and set times of the sun and the moon and the twilight times for the current date. When the moon rises in the evening it will set in the moring of the following day. This case is indicated with an asterisk *.

Transit time is the time when the object is at the highest point. Civil, Nautical and Astronomical twilight are defined as the times when the Sun is 6°, 12° and 18° below the horizon respectively. Roughly speaking,

• Civil twilight is when it's getting dark somewhat and you should switch on the lights of your car.
• Nautical twilight is when it gets dark enough for the brightest stars to be visible in the sky, which was important for nautical purposes, hence the name.
• Astronomical twilight is when it gets dark enough to observe even the faintest objects.

At the upper left of the screen the location is displayed. This text is sensitive, tapping on it brings you to the Location screen. The date text at the upper right is sensitive, too. Tapping on it lets you choose another date.

The rise and set times of the sun and the moon are defined as the time when the upper border crosses the horizon. The rise and set time calculations take an atmospheric refraction of about 0.5° into account.

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