Example Star
You observe the star Antares at a sextant ititude (Hs) of 38°18.7' on 28 February 1981. The index error is 2.4' on the arc. he height of eye is 40 feet (12.2 meters). What is the observed altitude ( Ho )?
BODY Antares
DATE 28 February 1981
DRLAT ----------
DRLONG - - - - - -
Hs 38°18.7'
IE - 2.4 on
Hs 38° 16.3'
Dip (40 ft) - 6.1'
Ha 38° 10.2'
ALT CORR - 1.2'
Ho 38° 09.0'
STEP 1
Record the given information in your format.
STEP 2
Apply your IE, in this case it is on the are, so we subtract it.
STEP3
Using the DIP Table on the inside cover of the Nautical Almanac, enter with your height of eye 40 feet = - 6.1'. Dip correction is always a minus correction
STEP4
On page A2 "Altitude Correction Tables 10° - 90° Sun, Stars, Planets" under the STARS AND PLANETS section. Enter with your Ha and find the AL T Correction. Altitude corrections for "stars and planets" are minus (-) corrections
