StarPilot TI-89 Celestial Navigation Calculator
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<b>[Product Information]</b><br>
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<li>Perpetual almanac accurate from 16th century to 2100</li>
<li>Planet and star ID by observed height and bearing</li>
<li>Sunrise and sunset times and bearings</li>
<li>Sun time and height at LAN</li>
<li>Nautical and Civil twilight times and LHA Aries at mid-twilight and more</li>
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