DO YOU KNOW HOW TO COMPUTE LONGITUDE WITHOUT A GPS?
HOW TO COMPUTE LONGITUDE WITH A WATCH AND SEXTANT: HAVE YOUR WATCH SET AT GMT (GREENWICH MEAN TIME, THE TIME IN GREENWICH ENGLAND, 0 DEGREES MERIDIAN):
THEN LATER AT SEA, ON NOON ANY DAY YOU SEEK LONGITUDE, CHECK YOUR SEXTANT FOR THE HIGHEST POINT THAT THE SUN REACHES IN THE SKY.THAT IS LOCAL NOON.
QUICKLY CHECK THE TIME SHOWN ON THE WATCH SET AT GMT & WRITE IT DOWN.
TAKE GMT TIME , SAY 10:30 PM, AND SUBTRACT 12:00 NOON FROM IT.(THIS IS IF YOU ARE GOING WEST FROM ENGLAND, BECAUSE THEN GMT WILL ALWAYS BE AHEAD OF YOUR WESTERLY TIME. IF GOING EAST, SUBTRACT GMT FROM YOUR TIME, AS YOU WILL BE AHEAD OF ENGLAND TIME.)
THAT IS, SUBTRACT 12:00 FROM 10:30 PM. YOU WILL HAVE TO CONVERT BOTH TIMES TO A 24 HR. MILITARY CLOCK . 1200 IS STILL 1200, BUT 1030 PM BECOMES 2230.
SO, 2230 (GMT) MINUS 1200 (LOCAL TIME) EQUALS = 10.30. THIS IS IN HOURS. YOU ARE 10 HOURS AND 30 MINUTES DIFFERENT IN TIME THAN GMT (ENGLAND).
THEN YOU MULTIPLY 15 TIMES 10.30 HRS., BECAUSE 1 HOUR EQUALS 15 DEGREES ON THE EARTH'S LONGITUDE GRID. 10.30 HOURS IS REALLY 10.5 HOURS
HENCE, 15 TIMES 10.5 IS 157.5 DEGREES.
SO, 157.5 DEGREES IS YOUR LONGITUDE. PUT A W ON THAT BECAUSE YOU ARE WEST OF GMT.
SO IT'S 157.5 W DEGREES.
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