On 23 May your 0628 zone time position was LAT 28°18.0'S, LONG 102°42.0'E. Your vessel was steaming on course 040°T at a speed of 20.0 knots. An observation of the Sun's lower limb was made at 0758 ZT. The chronometer read 01h 02m 06s and was fast 04m 04s. The observed altitude (Ho) was 13°16.7'. LAN occurred at 1201 zone time. The observed altitude (Ho) was 42°32.0'. What was the longitude of your 1201 zone time running fix?

Question

Accepted Answer

Option C: 104°03.5'E. Advance the 0758 ZT sun line to 1201 ZT using the vessel's course and speed. Calculate the longitude at LAN using the meridian altitude and the Equation of Time. Intersect the advanced line of position with the meridian longitude to find the 1201 ZT running fix.