Sight Reduction

This page allows you to compute sight reductions. Try Lat 39 ° 50.6 ´ N, Dec 23 ° 8.4 ´ N, LHA 8 ° 18.1 ´ N which gives Hc = 71 ° 52.8 ´ Z = 154 ° 43.7 ´

1. Enter your Latitude (L) ° ´
2. Enter the Declination of the body (D) ° ´
3. Enter the Hour Angle of the body (LHA or t) ° ´
4. Zenith Distance (z) °
5. Calculated Altitude Hc ( = 90-z ) °
6. P Polar Distance (co-D) of body °
7. Z azimuth (interior) angle of body °
8. Zn azimuth angle of body (from true north) °