Discussion in 'Alternate History Maps and Graphics' started by Lowtuff, Sep 29, 2015.

1. ### TsocharWell-Known Member

Joined:
May 9, 2010
Location:
Eagleland
When given the choice between math and "eyeballing it," I go with math because it's more reliable.

111 kilometers is the approximate distance of 1 degree of latitude on Earth's surface. It varies very little, between 110.6 km at the equator and 111.7 km at the poles. Lines of latitude are perfect circles on a sphere, with the center being on the poles.

Still assuming you live in Manila. If your north pole is at 12.6N, 8W (Bamako, Mali), then the distance between those points would be 13651 km, which divides to 123° almost exactly. 90°-123°=-33°, or 33S. So yes, you'd be 33 degrees from the equator.

You can do a check of the formula by looking at antipodal points.

Taipei, Taiwan, and Asunción, Paraguay, are very close to each other's antipodes, meaning they are nearly exactly on the opposite side of the world from each other. Let's say we want Taipei to be the north pole, 90°N. This means that its antipode, Asunción, should be very close to the south pole, which is 90°S. We put it into the map, which tells us the distance is 19947 kilometers (default is miles; remember to select kilometers!). 19947/111=179.7. 90-179.7=-89.3, which is close to -90. The formula checks out.

2. ### aja675Well-Known Member

Joined:
Aug 6, 2016
As for North America, I think the population is still gonna be less sparse than Australia because there would be lots of lakes and mountains to break up the outback.

Last edited: Feb 20, 2018
3. ### aja675Well-Known Member

Joined:
Aug 6, 2016
BTW, you wound up at 26.054054054 degrees south.

4. ### aja675Well-Known Member

Joined:
Aug 6, 2016
OK, so here's an updated version from the same person who made the modified map:

5. ### aja675Well-Known Member

Joined:
Aug 6, 2016
And I wound up at 33rd degrees north, roughly near/around Southern California.

6. ### Petros >Peter Fergus<Well-Known Member

Joined:
Oct 25, 2006
Regarding the most complete equatorial current idea - I think XKCD's Cassini could be the closest. It does have Antarctica in the way, but unlike the other versions, the current can flow around, and possibly through, Antarctica. After that it only has to wind it's way around Africa, and then thread it's way through the Bering Strait.

Again, I don't have image software on this PC, so imagine the equator, it's on the international date line -

If we're looking for maximum circumtropical currents, this isn't a bad place to start.

7. ### Lowtuff涼しい風

Joined:
Oct 23, 2011
Location:

hi, if you want the longest possible uninterrupted stretch of water then kamchatka-pakistan is as far as you should be able to go

8. ### TsocharWell-Known Member

Joined:
May 9, 2010
Location:
Eagleland
The longest unbroken line on ocean is not necessarily the equator with the most ocean, since that circumference also goes straight through a very mountainous patch of Central Asia and the Mongolian highlands.

Every circumference on a sphere's surface corresponds to a pair of poles, which means every point on a hemisphere has a unique circumference. There might be a program that could tell you how much land/water is on a given equator, and then run it for a set of lat/long pairs in the northern hemisphere, and then you could find the equator with the highest ocean percentage. Maybe a GIS program could do that, but I don't know how to use those.

9. ### RedcoatWanted in 19 different TimelinesBanned

Joined:
Nov 28, 2016
Location:
Long Island

Can someone make me a map with the equator following this line? It goes through Nantes, just outside of Zagreb, Bern and Varna, slices through Tasmania, reaches the tip of New Zealand, through the Panama/Costa Rica border, and just misses the Galapagos. Anyone up for it? My computer can't seem to download any of those mapping tools.

The North Pole is at 43.1 N and 178.5 E

Not even a basemap, I just want someone to generate the map.

Last edited: Feb 28, 2018
Zagan and Admiral A. Kolchak like this.
10. ### Petros >Peter Fergus<Well-Known Member

Joined:
Oct 25, 2006
Here is one basic projection tool, I think it will run on almost anything, this laptop is five years old.

http://www.petermoor.nl/overig/worldmap/

Does this look right?

Swede, Zagan and Redcoat like this.
11. ### RedcoatWanted in 19 different TimelinesBanned

Joined:
Nov 28, 2016
Location:
Long Island
It does! So many thanks to you.

12. ### RedcoatWanted in 19 different TimelinesBanned

Joined:
Nov 28, 2016
Location:
Long Island
Doesn't work on Windows 10.

Joined:
May 2, 2017
Here's one as close as I could make it. Robinson.

Miranda Brawner and Redcoat like this.
14. ### RedcoatWanted in 19 different TimelinesBanned

Joined:
Nov 28, 2016
Location:
Long Island
Can you get rid of the Lat.Lon lines pls? I need to be able to edit the map.

15. ### Petros >Peter Fergus<Well-Known Member

Joined:
Oct 25, 2006
D'oh! It's pretty old and it hasn't been updated in a while.

Some other posters have access to 'GProjector', but it didn't run on my last PC.

16. ### RedcoatWanted in 19 different TimelinesBanned

Joined:
Nov 28, 2016
Location:
Long Island
My PC seems to reject every program download I've done except Paint.net

Joined:
May 2, 2017
The generator doesn't allow me to do that. If you really want me to I can remove them manually, although it will take forever.

Redcoat likes this.

Joined:
May 2, 2017
I went with the "literally holding a ruler up to my screen approach".

Joined:
Jun 16, 2013
Location: