---
title: Magnetic Sea Chart by Halley
author: Edmond Halley
source: https://www.worldhistory.org/image/17954/magnetic-sea-chart-by-halley/
format: machine-readable-alternate
updated: 2023-09-28
---
# Magnetic Sea Chart by Halley
_Authored by Edmond Halley_
## Image File
[](https://www.worldhistory.org/uploads/images/17954.jpg)
## Image Caption
A detail of a chart showing lines of magnetic compass variation made in 1702 by the English scientist and cartographer [Edmond Halley](https://www.worldhistory.org/Edmond_Halley/) (1656-1742). Halley hoped the chart would aid navigation but the variations in magnetism over time made it useless. (Greenwich Museums, London)
## Cite This Work
### APA
Halley, E. (2023, September 28). Magnetic Sea Chart by Halley. *World History Encyclopedia*.
### Chicago
Halley, Edmond. "Magnetic Sea Chart by Halley." *World History Encyclopedia*, September 28, 2023. .
### MLA
Halley, Edmond. "Magnetic Sea Chart by Halley." *World History Encyclopedia*, 28 Sep 2023, .
## License & Copyright
[Original image](https://commons.wikimedia.org/wiki/File:A_new_and_correct_sea_chart_of_the_whole_world_shewing_the_variations_of_the_compass_as_they_were_found_in_the_year_M.D.CC._RMG_C0508.tiff) by [**Edmond Halley**](https://commons.wikimedia.org/wiki/File:A_new_and_correct_sea_chart_of_the_whole_world_shewing_the_variations_of_the_compass_as_they_were_found_in_the_year_M.D.CC._RMG_C0508.tiff). Submitted by [Mark Cartwright](https://www.worldhistory.org/user/markzcartwright/ "User Page: Mark Cartwright"), published on 28 September 2023. The copyright holder has published this content under the following license: [Public Domain](http://en.wikipedia.org/wiki/Public_domain). This item is in the public domain, and can be used, copied, and modified without any restrictions. Please note that content linked from this page may have different licensing terms.