Space. Sun Sight. * The index error is regarded as positive when the angle displayed by the instrument is greater than the actual angle.
Description: This celestial navigation software written in JavaScript performs all calculations necessary to derive a line of position from an observation of the sun. Enter date and time, longitude and latitude of your assumed position, and the altitude displayed by the instrument (sextant or theodolite). It is also possible to enter a zenith distance (measured by some theodolites).