How Do You Determine Latitude and Longitude

How Do You Determine Latitude and Longitude

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The old-school way to find latitude is super cool. You just look up at the night sky and spot the North Star (Polaris). Seriously, that tiny speck is like a cosmic GPS for the Northern Hemisphere.

Here’s the trick: the angle of the North Star above the horizon equals your latitude. If it’s 40 degrees up, you’re at 40° North. Easy, right? No fancy math, just you and a star having a quiet moment.

If you’re in the Southern Hemisphere, no fair peeking at Polaris—it’s not visible down there. Instead, you use the Southern Cross constellation. It’s a little trickier, but basically, you draw a line through the long axis of the cross, measure the angle to the horizon, and voilà—your latitude pops out. It’s like a treasure map in the sky.

What About During the Day?

If you’re daytime-lost (and not trying to be a vampire), you can use the sun. Grab a stick, stick it in the ground, and watch its shadow at noon. The shortest shadow of the day tells you the sun is at its highest point.

Then you measure the angle between the sun and the horizon using a tool called a sextant. Or, if you’re me, you just squint and guess. The formula is: latitude = 90° – (sun’s altitude at noon), plus or minus a correction for the season. It’s like a puzzle where the sun is doing math for you.

Pro tip: if you don’t have a sextant, you can use a protractor, a straw, and a piece of string. It’s not fancy, but it works. And if you mess up, just blame the clouds.

阿部 裕樹
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阿部 裕樹

マネー知識やキャリア形成に役立つノウハウを、初心者にも分かりやすく解説するのが得意です。