How to Determine Longitude
Record the top point of an object's shadow over the course of an hour.. Find the shortest shadow to determine local noon.. Check the UTC time when it was local noon.
Steps
Record the top point of an object's shadow over the course of an hour.
Record the top point of an object's shadow over the course of an hour.
Find the shortest shadow to determine local noon.
Find the shortest shadow to determine local noon.
Check the UTC time when it was local noon.
Check the UTC time when it was local noon.
Calculate the difference between local noon and UTC noon.
Calculate the difference between local noon and UTC noon.
Add 1º longitude for every 4 minutes' difference between UTC time and local time
Add 1º longitude for every 4 minutes' difference between UTC time and local time.
Choose a regional map from a reliable source.
Choose a regional map from a reliable source.
Pinpoint your location on the map using landmarks.
Pinpoint your location on the map using landmarks.
Identify the nearest longitude line to your point that's closest to the Prime Me
Identify the nearest longitude line to your point that's closest to the Prime Meridian.
Estimate the distance between your location and the longitude line.
Estimate the distance between your location and the longitude line.
Label your longitude east or west.
Label your longitude east or west.
Identify the map's projection and datum if you need to share your coordinates.
Identify the map's projection and datum if you need to share your coordinates.
Turn on your GPS receiver.
Turn on your GPS receiver.
Set your GPS receiver to the correct coordinate system.
Set your GPS receiver to the correct coordinate system.
Read the coordinates for your location.
Read the coordinates for your location.
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