I’ve been working on an update to Catfood Earth. Several people have asked me to draw the International Date Line on the time zones layer but I’ve struggled to find a decent source for the coordinates of the line segments. I finally ended up manually digitizing the version of the line that appears on Wikipedia. The original is licensed as Creative Commons Attribution-Share Alike 3.0 Unported so I’m making the coordinates below available under the same license:
| Longitude | Latitude |
| 180.0000 | 90.0000 |
| 180.0000 | 75.0000 |
| -169.2500 | 67.7356 |
| -169.2500 | 65.0189 |
| 170.0500 | 52.6863 |
| 180.0000 | 47.8353 |
| 180.0000 | -0.9000 |
| -159.6500 | -0.9000 |
| -159.6500 | 2.9000 |
| -161.8500 | 2.9000 |
| -161.8500 | 5.0000 |
| -155.9500 | 5.0000 |
| -150.6500 | -7.8000 |
| -150.6500 | -10.0000 |
| -156.0500 | -10.0000 |
| -156.0500 | -7.8000 |
| -178.0500 | -7.80000 |
| -172.7500 | -15.0000 |
| -172.7500 | -45.0000 |
| 180.0000 | -51.1815 |
| 180.0000 | -90.0000 |
This looks great for Catfood Earth. Please take the coordinates with a pinch of salt if you’re designing a cruise missile guidance system or something.