As the autumn equinox approaches, the sun's declination crosses the celestial equator, presenting unique opportunities for precise latitude checks by meridian altitude. Students preparing for our upcoming weekend sessions should review Chapter 4 of their nautical almanacs concerning equation of time corrections.
Sextant Maintenance and Mirror Alignment
Temperature fluctuations and transport can induce minor misalignments in index mirrors and horizon glasses. We have published a new reference guide detailing the four fundamental adjustments required to ensure your instrument remains free of side error, perpendicularity error, and collimation error.