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AstroNav Description

An electronic Nautical Almanac that includes a comprehensive catalogue of stars

AstroNav is an electronic Nautical Almanac that includes a comprehensive catalogue of stars.

By identifying any star from an altitude and azimuth it dramatically increases a sextant’s potential. Every visible body is a potential position line.

The speed with which sights can be plotted means that the quality of the horizon, can be determined by the result. Reasonable sights can be taken at night but few people will take their time to do so using manual calculation because the results are so variable.

The level of detail can be quickly and easily changed. It is a tool that can be used as a simple sight calculator or as a definative astronomical reference.

AstroNav’s accuracy is measured in fractions of an arc-second and contains a comprehensive list of stars visible with binoculars. (Mag 10/ 330,000 stars.) It will produce better results than tables by avoiding their inherent simplifications. (0’.5 is possible)

The difference between a comprehensive list of stars and a selected list is knowing when a sextant observation is ambiguous rather than simply rejecting an inconvenient result. AstroNav will convert a time, sextant altitude and approximate bearing to a plotted Position Line. It will usually identify the /a single body, however there are occasions when a choice exists in which case this will be apparent. (See Sights.) Up to nine sights can be combined while allowing for changes in course/ speed.

AltAz provides Sextant, Observed or True Altitudes together with True and/ or Magnetic bearings. These are always based on the position method chosen. (Fixed, by track or using a voyage plan. It can also be used to list stars around a point in the sky.

The Almanac screen can be used to produce conventional Nautical Almanac pages for any date between 9999 BC to 9999 AD. These can be used as backup or reference.

Celestial data has other applications thus the Twilight screen will calculate the times of Sunrise, Sunset and twilights for a month or voyage. Similarly data for the Sun, Moon and planets can be viewed over a period using the Solar Bodies Screen.

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