The mnemonic i use is latitude is flat.

I usually say to myself "ladder" and that helps. But this time I slipped. Rough morning. Wheels fell off on the way to work.

I say longitude goes longways, which I know isn't accurate except fairly close to the poles, but I remembered it like that when I was a kid and it stuck.

Longitude is also twice as long - 360 vs 180 degrees

Latitude is the only one that matters between the two.

I was going to ask if you were making a joke or just too tired to spell mnemonic correctly, but they would've been pneumatic, not pneumonic.

Edit: oh, boo, you fixed it.

latitude -> flatitude

I hate to admit it, but the Corona "Change your Latitude" ads are what locked it in for me.