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Nautical Almanac Free
2017 Nautical Almanac in pdf format which includes monthly star charts with the planets' positions. It also includes parallax corrections for the planets.Supplementary tables such as Increments and Corrections, Refraction a
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AstroNav Free Trial
Using the same standards of accuracy as published tables but with a catalogue extending beyond Barnard's Star; it can be used as a sight calculator, a definative astronomical reference or simply to print daily Nautical Alman