# Thread: come to 27 to a degree

1. ## come to 27 to a degree

Hi!
The following passage is from a portuguese Itinerary written 420 years ago and translated 115 years ago. It is about measuring the distance between two place. Of course, based on old scales. The Sentences printed in bold are problematic.

For these two marches, I can compare Teixeira's distances with the Indian Navy Map, a beautiful sheet, on a scale of 4,000 yards to the inch. As near as one can guess, his leagues come to 27 to a degree on the Equator. No accurate calculation is possible, but a league on that scale is a very fair hour's march for a laden camel.

Thanks very mucch

2. ## Re: come to 27 to a degree

Leagues are measurements of linear distance, while degrees are measurements of angles. One can measure distance by calculating difference in degrees of longitude and latitude.

It's not clear to me either, but my understanding is that the text is saying as near as anyone can guess, he traveled 27 leagues, rounded to the nearest whole degree (ignoring minutes and seconds) on a latitude along the equator.

I am not 100% certain that's what it's saying, however.

3. ## Re: come to 27 to a degree

I think you are right, Skrej.

4. ## Re: come to 27 to a degree

I think it is saying that one degree of change in latitude/longitude is equal to 27 "leagues" as the league is defined by this explorer.

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