At 2231 ZT on 14 July you are in DR position LAT 34°06'S, LONG 149°47'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 257.1°psc. The variation is 15°E. What is the deviation?

Question

At 2231 ZT on 14 July you are in DR position LAT 34&deg;06'S, LONG 149&deg;47'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 257.1&deg;psc. The variation is 15&deg;E. What is the deviation?

Accepted Answer

Option D: 2.5&deg;W. Determine Jupiter's true bearing at the visible horizon using standard celestial amplitude equations based on DR latitude and body declination. Compare true azimuth against psc observation and Easterly variation to calculate the exact compass deviation.

At 2231 ZT on 14 July you are in DR position LAT 34&deg;06'S, LONG 149&deg;47'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 257.1&deg;psc. The variation is 15&deg;E. What is the deviation?

At 2231 ZT on 14 July you are in DR position LAT 34°06'S, LONG 149°47'W, when you observe an amplitude of Jupiter. The planet is about one Sun's diameter above the visible horizon and bears 257.1°psc. The variation is 15°E. What is the deviation?