2play Astrolabe

完全に機能するアストロラーベ！太陽の位置から時間を計算します。

A fully functional digital astrolabe.

Now you too can tell the time with your phone! Take observations of the sun's elevation, and compute the current time in three simple steps. Accurate to about +/- 5 minutes.

And much more.

Navigate by the stars; figure out what time the sun will rise tomorrow morning; and the time of onset of total darkness. And hundreds more useful calculations.

Astrolabes are general-purpose astronomical computers, that can perform over 600 astronomical calculations, most of which can be performed on 2play Astrolabe.

Provides unique insights into how the universe revolves around us.