What is the difference in local time between an observer on 114°W and one on 119°W?
• Longitude and time relationship (how many minutes of time per degree of longitude) • Direction of longitude (east vs. west) and whether time is earlier or later • Difference between total degrees apart vs. time difference
• First, compute how many degrees of longitude separate 114°W and 119°W. • Recall how many minutes of time correspond to 1° of longitude on Earth. • Multiply the degrees difference by the time per degree, then compare your result with the choices.
• Confirm the correct conversion factor between degrees of longitude and minutes of time (don’t confuse with nautical miles). • Make sure you are using the absolute difference in longitude, not adding them. • Check that your final answer is in minutes of time, not degrees or hours.
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